REINFORCED GLASS PLATE, METHOD FOR MANUFACTURING REINFORCED GLASS PLATE, AND GLASS PLATE TO BE REINFORCED

Abstract

The present invention provides a tempered glass sheet including as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of SrO, 0% to 10% of BaO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0.

Claims

1. A tempered glass sheet having a compressive stress layer in a surface thereof, the tempered glass sheet comprising as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of SrO, 0% to 10% of BaO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0.

2. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a Z value calculated by the following equation of 18.0 or more. $Z = 0.1 3 [S i O_{2}] + 2.3 6 [A l_{2} O_{3}] - 0.1 4 [B_{2} O_{3}] + 4.9 [L i_{2} O] - 5.53 [N a_{2} O] - 2.1 4 [M g O] - 2.34 [C a O]$

3. The tempered glass sheet according to claim 2, wherein the tempered glass sheet has a Z value calculated by the following equation of 20.0 or more. $Z = 0.1 3 [S i O_{2}] + 2.3 6 [A l_{2} O_{3}] - 0.1 4 [B_{2} O_{3}] + 4.9 [L i_{2} O] - 5.53 [N a_{2} O] - 2.1 4 [M g O] - 2.34 [C a O]$

4. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a molar ratio [Na.sub.2O]/[Li.sub.2O] of 1.0 or less.

5. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a Y value calculated by the following equation of 5.0 or more. $Y = 3 + 0.21 [S i O_{2}] + 0.2 5 [A l_{2} O_{3}] - 0.3 3 [B_{2} O_{3}] - 0.55 [L i_{2} O] + 0.4 5 [N a_{2} O] - 0.9 7 [M g O] - 1.46 [C a O]$

6. The tempered glass sheet according to claim 5, wherein the tempered glass sheet has a Y value calculated by the following equation of from 6.0 to 30. $Y = 3 + 0.21 [S i O_{2}] + 0.2 5 [A l_{2} O_{3}] - 0.3 3 [B_{2} O_{3}] - 0.55 [L i_{2} O] + 0.4 5 [N a_{2} O] - 0.9 7 [M g O] - 1.46 [C a O]$

7. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has an X value calculated by the following equation of 300 or more. $X = - 1.49 [S i O_{2}] + 2 6.9 8 [A l_{2} O_{3}] - 3.23 [B_{2} O_{3}] + 48.56 [L i_{2} O] - 2 4.3 1 [N a_{2} O] - 0.28 [M g O] + 2.7 4 [C a O]$

8. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a W value calculated by the following equation of 340 or more. $W = 0.0 7 [S i O_{2}] + 1 8.1 7 [A l_{2} O_{3}] - 4.42 [B_{2} O_{3}] + 41.43 [L i_{2} O] - 29.3 [N a_{2} O] + 1.43 [M g O] - 10.43 [C a O]$

9. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a value of [Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] of 10.5% or more.

10. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] of 0.1 or more.

11. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a U value calculated by the following equation of 7,000 or more. $U = 8 7.3 9 [S i O_{2}] + 1 8 0.1 2 [A l_{2} O_{3}] + 93.63 [B_{2} O_{3}] + 113.78 ([M g O] + [C a O] + [B a O] + [S r O]) - 46.2 [L i_{2} O] - 7 1 .1 [N a_{2} O] - 5 8.6 [K_{2} O] - 4 0.0 [P_{2} O_{5}]$

12. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a Q value calculated by the following equation of 30 or more. $Q = [S i O_{2}] + 1.2 [P_{2} O_{5}] - 3 [A l_{2} O_{3}] - [B_{2} O_{3}] - 2 [L i_{2} O] - 1.5 [N a_{2} O] - [K_{2} O]$

13. The tempered glass sheet according to claim 1, wherein the tempered glass sheet comprises Cl as the glass composition and has a content of Cl of 0.02 mol % or more.

14. The tempered glass sheet according to claim 1, wherein the tempered glass sheet comprises MoO.sub.3 as the glass composition and has a content of MoO.sub.3 of 0.0001 mol % or more.

15. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a softening point (Ts) of 920 C. or less.

16. The tempered glass sheet according to claim 1, wherein a compressive stress value CS of the compressive stress layer on an outermost surface is from 200 MPa to 1,400 MPa, and wherein a depth of compression DOC of the compressive stress layer is from 3 m to 200 m.

17. The tempered glass sheet according to claim 1, wherein a depth of compression DOC of the compressive stress layer is from 50 m to 200 m, and wherein a compressive stress value CS30 of the compressive stress layer at a depth of 30 m from an outermost surface is from 35 MPa to 400 MPa.

18. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has a temperature at a viscosity at high temperature of 10.sup.2.5 dPa.Math.s of 1,680 C. or less.

19. The tempered glass sheet according to claim 1, wherein the tempered glass sheet has an overflow-merged surface in an inside thereof.

20. The tempered glass sheet according to claim 1, wherein a stress profile of the tempered glass sheet in a thickness direction has an inflection point.

21. A tempered glass sheet, comprising as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 1% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of BaO, 0% to 10% of SrO, 0% to 10% of ZnO, 0% to 4% of P.sub.2O.sub.5, 0.001% to 0.1% of TiO.sub.2, 0% to 10% of ZrO.sub.2, 0.001% to 0.1% of Fe.sub.2O.sub.3, and 0.001% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0.

22. A method of manufacturing a tempered glass sheet, comprising: a preparation step of preparing a glass sheet to be tempered including as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of BaO, 0% to 10% of SrO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0; and an ion exchange step of subjecting the glass sheet to be tempered to ion exchange treatment a plurality of times to provide a tempered glass sheet having a compressive stress layer in a surface thereof.

23. A glass sheet to be tempered, comprising as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of BaO, 0% to 10% of SrO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0.

24. The glass sheet to be tempered according to claim 23, wherein the glass sheet to be tempered has a Na ion mutual diffusion coefficient D.sub.Na at 380 C. of from 110.sup.14 m.sup.2 sec.sup.1 to 110.sup.11 m.sup.2 sec.sup.1, wherein the glass sheet to be tempered has a K ion mutual diffusion coefficient D.sub.K at 380 C. of from 110.sup.17 m.sup.2 sec.sup.1 to 110.sup.14 m.sup.2 sec.sup.1, and wherein the glass sheet to be tempered has a ratio D.sub.K/D.sub.Na of 0.0001 or more.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0074] FIG. 1 is an explanatory view for illustrating an example of a stress profile having a first peak a, a first bottom b, a second peak c, and a second bottom d.

[0075] FIG. 2 is an explanatory view for illustrating a low compressive stress region in the stress profile of FIG. 1 in an enlarged manner.

[0076] FIG. 3 is an explanatory view for illustrating an example of a stress profile having an inflection point e.

[0077] FIG. 4 is a graph showing stress profiles of Examples 2-1 to 2-3.

[0078] FIG. 5 is a graph showing low compressive stress regions in the stress profiles of Examples 2-1 to 2-3 of FIG. 4 in an enlarged manner.

[0079] FIG. 6 is a graph showing stress profiles of Examples 3-1 and 3-2.

[0080] FIG. 7 is a graph showing low compressive stress regions in the stress profiles of Examples 3-1 and 3-2 of FIG. 6 in an enlarged manner.

[0081] FIG. 8 is a graph showing stress profiles of Examples 4-1 to 4-4.

[0082] FIG. 9 is a graph showing low compressive stress regions in the stress profiles of Examples 4-1 to 4-4 of FIG. 8 in an enlarged manner.

[0083] FIG. 10 is an explanatory view for illustrating an example of a Na ion concentration profile measured with an EPMA.

DESCRIPTION OF EMBODIMENTS

[0084] In the present invention, the term tempered glass sheet refers to a glass sheet having been subjected to ion exchange treatment and having a compressive stress layer in a surface thereof. The term glass sheet to be tempered refers to a glass sheet not having been subjected to the ion exchange treatment (before the ion exchange treatment).

[0085] A tempered glass sheet (glass sheet to be tempered) of the present invention comprises as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of BaO, 0% to 10% of SrO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, has a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and has a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0. Reasons why the content ranges of the components are restricted are described below. In the description of the content range of each component, the expression % means mol % unless otherwise specified.

[0086] SiO.sub.2 is a component that forms a glass network. When the content of SiO.sub.2 is too small, vitrification does not occur easily, and a thermal expansion coefficient becomes too high, with the result that thermal shock resistance is liable to be reduced. Accordingly, a suitable lower limit range of the content of SiO.sub.2 is 50% or more, 52% or more, 55% or more, 57% or more, 58% or more, 58.5% or more, 59% or more, 60% or more, 61% or more, 62% or more, 62.5% or more, or 63% or more, particularly 63.5% or more. Meanwhile, when the content of SiO.sub.2 is too large, meltability and formability are liable to be reduced, and the thermal expansion coefficient is excessively reduced, with the result that it becomes difficult to match the thermal expansion coefficient with those of peripheral materials. Accordingly, a suitable upper limit range of the content of SiO.sub.2 is 80% or less, 75% or less, 73% or less, 72% or less, 71% or less, 70.5% or less, 70% or less, 69.5% or less, 69% or less, 68.5% or less, 68% or less, 67.8% or less, 67.5% or less, or 67.2% or less, particularly 67% or less.

[0087] Al.sub.2O.sub.3 is a component improves ion exchange performance, and is also a component that increases a strain point, a Young's modulus, fracture toughness, and a Vickers hardness. Accordingly, a suitable lower limit range of the content of Al.sub.2O.sub.3 is 7% or more, 7.2% or more, 7.5% or more, 7.8% or more, 8% or more, 8.2% or more, 8.5% or more, 9% or more, 9.2% or more, 9.4% or more, 9.5% or more, 9.8% or more, 10.0% or more, 10.3% or more, 10.5% or more, 10.8% or more, 11% or more, 11.2% or more, 11.4% or more, or 11.6% or more, particularly 11.8% or more. Meanwhile, when the content of Al.sub.2O.sub.3 is too large, a viscosity at high temperature is increased, with the result that the meltability and the formability are liable to be reduced. In addition, a devitrified crystal is liable to be precipitated in glass, and it becomes difficult to form the glass into a sheet shape by an overflow down-draw method or the like. Particularly when the glass is formed into a sheet shape by an overflow down-draw method involving using alumina-based refractory as forming body refractory, a devitrified crystal of spinel is liable to be precipitated at an interface with the alumina-based refractory. Further, acid resistance is reduced, with the result that it becomes difficult to subject the glass to an acid treatment step. Accordingly, a suitable upper limit range of the content of Al.sub.2O.sub.3 is 25% or less, 23% or less, 21% or less, 20.5% or less, 20% or less, 19.8% or less, 19.5% or less, 19.0% or less, 18.5% or less, 18% or less, 17.5% or less, 17% or less, 16.5% or less, 15.5% or less, 15.2% or less, 15% or less, 14.9% or less, 14.7% or less, 14.5% or less, 14.3% or less, 14% or less, or 13.5% or less, particularly 13% or less. When the content of Al.sub.2O.sub.3, which has a large influence on the ion exchange performance, is set to fall within the suitable ranges, it becomes easy to form a profile having a first peak a, a first bottom b, a second peak c, and a second bottom d.

[0088] B.sub.2O.sub.3 is a component that reduces the viscosity at high temperature and a density, and stabilizes the glass to cause less precipitation of a crystal, to thereby reduce a liquidus temperature. In addition, B.sub.2O.sub.3 is a component that increases fracture toughness K1c and fracture energy . Further, B.sub.2O.sub.3 is a component that increases oxygen electron constraint force exhibited by a cation to reduce the basicity of the glass. When the content of B.sub.2O.sub.3 is too small, a depth of compression (DOC.sub.Na) obtained through ion exchange between a Li ion in the glass and a Na ion in a molten salt is excessively increased, with the result that a compressive stress value at a predetermined depth (from 5 m to 50 m) from the outermost surface is liable to be reduced. In addition, the glass may become unstable, and devitrification resistance may be reduced. In addition, the basicity of the glass is excessively increased, and the release amount of O.sub.2 through a reaction of a fining agent is reduced to reduce a bubble forming property, with the result that bubbles may remain in the glass when the glass is formed into a sheet shape. Accordingly, a suitable lower limit range of the content of B.sub.2O.sub.3 is 0% or more, 0.10% or more, 0.15% or more, 0.20% or more, 0.30% or more, 0.4% or more, 0.5% or more, 0.6% or more, 0.7% or more, 0.8% or more, 0.9% or more, 1% or more, 1.5% or more, 2% or more, 2.5% or more, 3% or more, 3.5% or more, or 4% or more, particularly 4.5% or more. Meanwhile, when the content of B.sub.2O.sub.3 is too large, a depth of compression may be reduced. In particular, the efficiency of ion exchange between a Na ion in the glass and a K ion in the molten salt is liable to be reduced, and the diffusion of the K ion is liable to be reduced. Accordingly, a suitable upper limit range of the content of B.sub.2O.sub.3 is 15% or less, 14.5% or less, 14% or less, 13.5% or less, 13% or less, 12.5% or less, 12% or less, 11.5% or less, 11% or less, 10.5% or less, 10% or less, 9.5% or less, 9% or less, 8.5% or less, 8% or less, 7.5% or less, 7% or less, 6.5% or less, or 6% or less, particularly 5.5% or less. When the content of B.sub.2O.sub.3 is set to fall within the suitable ranges, it becomes easy to form the profile having the first peak a, the first bottom b, the second peak c, and the second bottom d.

[0089] Li.sub.2O is an ion exchange component, and is particularly an essential component for obtaining a large depth of compression through ion exchange between a Li ion in the glass and a Na ion in the molten salt. In addition, Li.sub.2O is a component that reduces the viscosity at high temperature to improve the meltability and the formability, and is also a component that increases the Young's modulus. Accordingly, a suitable lower limit range of the content of Li.sub.2O is 0% or more, 0.1% or more, 0.5% or more, 1% or more, 1.5% or more, 2% or more, 2.5% or more, 3% or more, 3.5% or more, 4% or more, 4.3% or more, 4.5% or more, 4.7% or more, 5% or more, 5.2% or more, 5.5% or more, or 5.8% or more, particularly 6.0% or more. In addition, a suitable upper limit range of the content of Li.sub.2O is 15% or less, 13% or less, 12% or less, 11.5% or less, 11% or less, 10.5% or less, 10% or less, 9.8% or less, 9.5% or less, 9.3% or less, 9% or less, 8.8% or less, 8.5% or less, or 8.2% or less, particularly 8.0% or less.

[0090] Na.sub.2O is an ion exchange component, and is also a component that reduces the viscosity at high temperature to improve the meltability and the formability. In addition, Na.sub.2O is a component that improves the devitrification resistance, and is particularly a component that suppresses devitrification caused by a reaction with alumina-based refractory. Accordingly, a suitable lower limit range of the content of Na.sub.2O is 0% or more, 0.5% or more, 1% or more, 1.2% or more, 1.5% or more, 1.8% or more, 2% or more, 2.1% or more, 2.3% or more, 2.5% or more, 2.8% or more, 3% or more, 3.2% or more, 3.5% or more, 4% or more, 4.5% or more, 5% or more, 5.5% or more, 6% or more, or 6.5% or more, particularly 7% or more. Meanwhile, when the content of Na.sub.2O is too large, the thermal expansion coefficient is excessively increased, and the thermal shock resistance is liable to be reduced. In addition, the glass composition loses its component balance, and the devitrification resistance may be reduced contrarily. Accordingly, a suitable upper limit range of the content of Na.sub.2O is 25% or less, 21% or less, 20% or less, or 19% or less, particularly 18% or less, 15% or less, 13% or less, or 11% or less, particularly 10% or less.

[0091] K.sub.2O is a component that reduces the viscosity at high temperature to improve the meltability and the formability. Further, K.sub.2O is a component that increases the depth of compression. Accordingly, a suitable lower limit range of the content of K.sub.2O is 0% or more, 0.01% or more, 0.02% or more, 0.03% or more, 0.05% or more, 0.08% or more, 0.1% or more, 0.2% or more, 0.3% or more, or 0.4% or more, particularly 0.5% or more. Meanwhile, when the content of K.sub.2O is too large, the thermal expansion coefficient may be increased, and the thermal shock resistance may be reduced. In addition, a compressive stress value on the outermost surface is liable to be reduced. Accordingly, a suitable upper limit range of the content of K.sub.2O is 10% or less, 7% or less, 6% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1.5% or less, or 1% or less, particularly less than 1%.

[0092] MgO is a component that reduces the viscosity at high temperature to improve the meltability and the formability, and increases the strain point and the Vickers hardness. Among alkaline earth metal oxides, MgO is a component that has a high improving effect on the ion exchange performance. Accordingly, a suitable lower limit range of the content of MgO is 0% or more, 0.03% or more, 0.05% or more, 0.07% or more, 0.10% or more, 0.15% or more, 0.2% or more, 0.5% or more, 0.6% or more, 0.7% or more, 1.0% or more, or 1.5% or more, particularly 1.8% or more. Meanwhile, when the content of MgO is too large, the devitrification resistance is liable to be reduced. In particular, it becomes difficult to suppress devitrification caused by a reaction with alumina-based refractory. Accordingly, a suitable upper limit range of the content of MgO is 15% or less, 12% or less, 11% or less, 10% or less, 8% or less, 7% or less, 6.5% or less, 6% or less, 5.5% or less, 5% or less, 4.7% or less, 4.5% or less, 4.2% or less, 4% or less, or 3.8% or less, particularly 3.5% or less.

[0093] CaO is a component that reduces the viscosity at high temperature to improve the meltability and the formability without reducing the devitrification resistance as compared to other components, and increases the strain point and the Vickers hardness. However, when the content of CaO is too large, the ion exchange performance may be reduced, or an ion exchange solution may be degraded at the time of ion exchange treatment. Accordingly, the content of CaO is preferably from 0% to 10%, from 0% to 9%, from 0% to 8%, from 0% to 7%, from 0% to 6%, from 0% to 5.5%, from 0% to 5%, from 0% to 4.5%, from 0% to 4%, from 0% to 3.5%, from 0% to 3%, from 0% to 2%, from 0% to 18, from 0% to less than 1%, from 0% to 0.7%, from 0% to 0.5%, from 0% to 0.3%, from 0% to 0.1%, from 0% to 0.05%, or from 0% to 0.02%, particularly preferably from 0% to less than 0.01%. When mixing of CaO as an impurity is permitted, the content of CaO is preferably 0.01% or more or 0.02% or more, particularly preferably 0.03% or more.

[0094] SrO is a component that reduces the viscosity at high temperature to improve the meltability and the formability, and increases the strain point and the Young's modulus. However, when the content of SrO is too large, an ion exchange reaction is liable to be inhibited. Besides, the density or the thermal expansion coefficient is increased inappropriately, or the glass is liable to devitrify. Accordingly, the content of SrO is preferably from 0% to 2%, from 0% to 1.5%, from 0% to 1%, from 0% to 0.5%, or from 0% to 0.1%, particularly preferably from 0% to less than 0.1%.

[0095] BaO is a component that reduces the viscosity at high temperature to improve the meltability and the formability, and increases the strain point and the Young's modulus. However, when the content of BaO is too large, the ion exchange reaction is liable to be inhibited. Besides, the density or the thermal expansion coefficient is increased inappropriately, or the glass is liable to devitrify. Accordingly, the content of BaO is preferably from 0% to 2%, from 0% to 1.5%, from 0% to 1%, from 0% to 0.5%, or from 0% to 0.1%, particularly preferably from 0% to less than 0.1%.

[0096] ZnO is a component that improves the ion exchange performance, and is particularly a component that has a high increasing effect on the compressive stress value of the compressive stress layer on the outermost surface. In addition, ZnO is a component that reduces the viscosity at high temperature without significantly reducing a viscosity at low temperature. Meanwhile, when the content of ZnO is too large, there is a tendency that the glass undergoes phase separation, the devitrification resistance is reduced, the density is increased, or the depth of compression is reduced. Accordingly, a suitable upper limit range of the content of ZnO is 10% or less, 8% or less, 7% or less, 6% or less, 5.5% or less, 5.2% or less, 5% or less, or 4.5% or less, particularly 4% or less. A suitable lower limit range of the content of ZnO is 0% or more, 0.1% or more, 0.2% or more, 0.3% or more, 0.4% or more, 0.5% or more, 0.7% or more, 1% or more, 1.1% or more, 1.2% or more, 1.5% or more, 1.8% or more, 2.0% or more, 2.1% or more, 2.2% or more, 2.5% or more, 2.8% or more, 3.0% or more, 3.1% or more, or 3.2% or more, particularly 3.5% or more.

[0097] P.sub.2O.sub.5 is a component that improves the ion exchange performance, and is particularly a component that increases the depth of compression. Further, P.sub.2O.sub.5 is a component that improves the acid resistance. Further, P.sub.2O.sub.5 is a component that increases the oxygen electron constraint force exhibited by a cation to reduce the basicity of the glass. However, when the content of P.sub.2O.sub.5 is too large, the glass undergoes phase separation, and water resistance is liable to be reduced. In addition, the depth of compression (DOC.sub.Na) obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt is excessively increased, with the result that the compressive stress value at a predetermined depth (from 5 m to 50 m) from the outermost surface is liable to be reduced. Accordingly, a suitable upper limit range of the content of P.sub.2O.sub.5 is 15% or less, 10% or less, 8% or less, 7% or less, 6% or less, 5% or less, 4.7% or less, 4.5% or less, or 4% or less, particularly 3.5% or less. When the content of P.sub.2O.sub.5 is set to fall within the suitable ranges, it becomes easy to form a non-monotonic profile. Meanwhile, when the content of P.sub.2O.sub.5 is too small, the ion exchange performance may not be sufficiently exhibited. In particular, the efficiency of ion exchange between a Na ion in the glass and a K ion in the molten salt is liable to be reduced, and the diffusion of the K ion is liable to be reduced. In addition, the glass may become unstable, and the devitrification resistance may be reduced. In addition, the basicity of the glass is excessively increased, and the release amount of O.sub.2 through a reaction of a fining agent is reduced to reduce the bubble forming property, with the result that bubbles may remain in the glass when the glass is formed into a sheet shape. Accordingly, a suitable lower limit range of the content of P.sub.2O.sub.5 is 0% or more, 0.01% or more, 0.02% or more, 0.03% or more, 0.05% or more, 0.1% or more, 0.4% or more, 0.7% or more, 1% or more, 1.2% or more, 1.4% or more, 1.6% or more, 2% or more, or 2.3% or more, particularly 2.5% or more.

[0098] SnO.sub.2 is a fining agent, and is also a component that improves the ion exchange performance. However, when the content of SnO.sub.2 is too large, the devitrification resistance is liable to be reduced. Accordingly, a suitable lower limit range of the content of SnO.sub.2 is 0% or more, 0.001% or more, 0.002% or more, 0.005% or more, or 0.007% or more, particularly 0.010% or more, and a suitable upper limit range thereof is 0.30% or less, 0.27% or less, 0.25% or less, 0.20% or less, 0.18% or less, 0.15% or less, 0.12% or less, 0.10% or less, 0.09% or less, 0.08% or less, 0.07% or less, 0.06% or less, 0.05% or less, 0.047% or less, 0.045% or less, 0.042% or less, 0.040% or less, 0.038% or less, 0.035% or less, 0.032% or less, 0.030% or less, 0.025% or less, or 0.020% or less, particularly 0.015% or less.

[0099] Cl is a fining agent. Particularly when Cl is used in combination with SnO.sub.2, a bubble diameter in the glass is easily expanded, and a fining effect is easily exhibited. Meanwhile, Cl is a component that adversely affects an environment or a facility when the content thereof is too large. Accordingly, a suitable lower limit range of the content of cl is 0.001% or more, 0.005% or more, 0.008% or more, 0.010% or more, 0.015% or more, 0.018% or more, 0.019% or more, 0.020% or more, 0.023% or more, 0.025% or more, 0.027% or more, 0.030% or more, 0.035% or more, 0.040% or more, 0.050% or more, 0.07% or more, or 0.09% or more, particularly 0.10% or more, and a suitable upper limit range thereof is 0.3% or less, 0.2% or less, 0.17% or less, or 0.15% or less, particularly 0.12% or less.

[0100] MoO.sub.3 is a component that absorbs UV light (light at a wavelength of from 200 nm to 300 nm). When MoO.sub.3 is incorporated in the glass, an internal element of a device using the tempered glass sheet of the present invention as a cover glass can be prevented from being degraded by UV light. In addition, MoO.sub.3 is a component that is mixed in through a manufacturing process as well. Particularly when a raw material batch is melted through electric melting heating, MoO.sub.3 is mixed in by being eluted from a Mo electrode. The use of electric melting can reduce the amount of water in the glass. When the amount of water in the glass is reduced, a liquidus viscosity and the strain point are increased, and the devitrification resistance and heat resistance of the glass can be improved. In addition, when the strain point is increased, stress relaxation is less liable to occur, and a high compressive stress value can be maintained. When the content of MoO.sub.3 is too small, the electric melting, which may involve mixing of MoO.sub.3, cannot be used, and hence the above-mentioned effects are not obtained. Accordingly, a suitable lower limit range of the content of MoO.sub.3 is 0% or more, 0.0001% or more, 0.0003% or more, 0.0005% or more, 0.0008% or more, 0.001% or more, 0.0012% or more, or 0.0015% or more, particularly 0.002% or more. Meanwhile, when the content of MoO.sub.3 is too large, the transmittance of a cover glass is liable to be reduced. Accordingly, a suitable upper limit range of the content of MoO.sub.3 is 0.02% or less, 0.018% or less, 0.015% or less, 0.012% or less, 0.01% or less, 0.008% or less, 0.007% or less, 0.006% or less, or 0.005% or less, particularly less than 0.004%.

[0101] A suitable lower limit range of [B.sub.2O.sub.3]+[MgO]+[CaO], which is the total of the contents of B.sub.2O.sub.3, MgO, and CaO, is 0.1% or more, 0.5% or more, 0.8% or more, 1% or more, 2% or more, 3% or more, 3.5% or more, 4% or more, 5% or more, 6% or more, or 6.5% or more, particularly 7% or more. When the value of [B.sub.2O.sub.3]+[MgO]+[CaO] is too small, it is difficult to reduce the softening point. Meanwhile, when the value of [B.sub.2O.sub.3]+[MgO]+[CaO] is too large, the glass may become unstable, and the devitrification resistance may be reduced. Accordingly, a suitable upper limit range of [B.sub.2O.sub.3]+[MgO]+[CaO] is 30% or less, 28% or less, 25% or less, 24% or less, 22% or less, or 20% or less, particularly 18% or less.

[0102] A suitable lower limit range of [Li.sub.2O]+[Na.sub.2O]+[K.sub.2O], which is the total of the contents of Li.sub.2O, Na.sub.2O, and K.sub.2O, is 7% or more, 7.5% or more, 8% or more, 8.5% or more, 8.8% or more, 9% or more, 9.5% or more, 9.7% or more, 10% or more, or 10.2% or more, particularly 10.5% or more. When the value of [Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is too small, the efficiency of ion exchange is liable to be reduced, and it is difficult to reduce the softening point. Meanwhile, when the value of [Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is too large, chemical resistance may be reduced. A suitable upper limit range of [Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is 30% or less, 28% or less, 25% or less, or 24% or less, particularly 23% or less.

[0103] A suitable lower limit range of [Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O], which is the total of the contents of Al.sub.2O.sub.3, Li.sub.2O, Na.sub.2O, and K.sub.2O, is 10.5% or more, 11% or more, 11.5% or more, 12.0% or more, 12.3% or more, 12.5% or more, 13.0% or more, 14.0% or more, 15% or more, 16% or more, 18% or more, 19% or more, 20% or more, 21% or more, 24% or more, 25% or more, or 28% or more, particularly 30% or more. When the value of [Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is too small, the efficiency of ion exchange is liable to be reduced, and it is difficult to reduce the softening point. Meanwhile, when the value of [Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is too large, the liquidus viscosity and the chemical resistance may be reduced. A suitable upper limit range of [Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O] is 45% or less, 40% or less, 38% or less, or 35% or less, particularly 33% or less.

[0104] A suitable lower limit range of a molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is 0.5 or more, 0.6 or more, 0.7 or more, 0.75 or more, 0.8 or more, 0.85 or more, or 0.9 or more, particularly 0.95 or more. When the molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is too low, the efficiency of ion exchange is liable to be reduced. Meanwhile, also when the molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is too high, the efficiency of ion exchange is liable to be reduced. Accordingly, a suitable upper limit range of the molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is 2.0 or less, 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less, or 1.4 or less, particularly 1.3 or less. The molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] refers to a value obtained by dividing the total of the contents of Li.sub.2O, Na.sub.2O, and K.sub.2O by the content of Al.sub.2O.sub.3.

[0105] A suitable upper limit range of a molar ratio [Al.sub.2O.sub.3]/([R.sub.2O]+[RO]) is 1.5 or less, 1.4 or less, 1.3 or less, 1.2 or less, 1.1 or less, or 1 or less, particularly 0.9 or less. When the molar ratio [Al.sub.2O.sub.3]/([R.sub.2O]+[RO]) is too high, the viscosity at high temperature is increased, with the result that the meltability and the formability are liable to be reduced. Meanwhile, when the molar ratio [Al.sub.2O.sub.3]/([R.sub.2O]+[RO]) is too low, the liquidus temperature may be increased, and the liquidus viscosity may be reduced. Accordingly, a suitable lower limit range of the molar ratio [Al.sub.2O.sub.3]/([R.sub.2O]+[RO]) is 0.2 or more, 0.25 or more, 0.3 or more, or 0.35 or more, particularly 0.4 or more. The molar ratio [Al.sub.2O.sub.3]/([R.sub.2O]+[RO]) refers to a value obtained by dividing the content of Al.sub.2O.sub.3 by the total of the total content R.sub.2O of alkali metal oxides and the total content RO of alkaline earth oxides.

[0106] A suitable upper limit range of a molar ratio [Na.sub.2O]/[Li.sub.2O] is 1.0 or less, 0.9 or less, 0.8 or less, 0.7 or less, 0.6 or less, 0.5 or less, 0.4 or less, or 0.35 or less, particularly 0.3 or less. When the molar ratio [Na.sub.2O]/[Li.sub.2O] is too high, the efficiency of ion exchange between a Li ion in the glass and a Na ion in the molten salt is liable to be reduced. Meanwhile, when the molar ratio [Na.sub.2O]/[Li.sub.2O] is too low, the efficiency of ion exchange between a Na ion in the glass and a K ion in the molten salt is liable to be reduced. The molar ratio [Na.sub.2O]/[Li.sub.2O] is preferably 0.03 or more, 0.05 or more, 0.07 or more, 0.10 or more, or 0.15 or more, particularly preferably 0.2 or more. The molar ratio [Na.sub.2O]/[Li.sub.2O] refers to a value obtained by dividing the content of Na.sub.2O by the content of Li.sub.2O.

[0107] A suitable lower limit range of a molar ratio ([ZnO]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is 0.7 or more, 0.75 or more, 0.8 or more, 0.85 or more, or 0.9 or more, particularly 0.95 or more. When the molar ratio ([ZnO]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is too low, the efficiency of ion exchange is liable to be reduced, and it is difficult to reduce the softening point. Meanwhile, also when the molar ratio ([ZnO]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is too high, the efficiency of ion exchange is liable to be reduced. Accordingly, a suitable upper limit range of the molar ratio ([ZnO]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] is 2 or less, 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less, or 1.4 or less, particularly 1.3 or less. The molar ratio ([ZnO]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] refers to a value obtained by dividing the total of the contents of ZnO, Li.sub.2O, Na.sub.2O, and K.sub.2O by the content of Al.sub.2O.sub.3.

[0108] A molar ratio [MgO]/[Al.sub.2O.sub.3] is preferably 1.0 or less, 0.8 or less, 0.6 or less, 0.5 or less, 0.4 or less, 0.3 or less, or 0.25 or less, particularly preferably 0.2 or less. When the molar ratio [MgO]/[Al.sub.2O.sub.3] is too high, reaction stones are liable to be generated at the time of contact with a forming body (particularly, an alumina forming body) at high temperature, with the result that the quality of the glass formed into a sheet shape may be reduced. Meanwhile, the lower limit of the molar ratio [MgO]/[Al.sub.2O.sub.3] is not particularly limited, but is, for example, 0 or more, 0.01 or more, 0.03 or more, or 0.05 or more. The molar ratio [MgO]/[Al.sub.2O.sub.3] refers to a value obtained by dividing the content of MgO by the content of Al.sub.2O.sub.3.

[0109] When the range of a molar ratio ([SiO.sub.2]+[B.sub.2O.sub.3]+[P.sub.2O.sub.5])/((100[SnO.sub.2])([Li 20]+[Na.sub.2O]+[K.sub.2O]+[MgO]+[CaO]+[BaO]+[SrO]+[ZnO]+[Al.sub.2O.sub.3])) is restricted, the devitrification resistance can be improved while a fining property is improved. A suitable lower limit range of the molar ratio ([SiO.sub.2]+[B.sub.2O.sub.3]+[P.sub.2O.sub.5])/((100[SnO.sub.2])([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O]+[MgO]+[CaO]+[BaO]+[SrO]+[ZnO]+[Al.sub.2O.sub.3])) is 0.30 or more, 0.33 or more, 0.35 or more, 0.37 or more, 0.38 or more, 0.39 or more, 0.40 or more, 0.41 or more, 0.42 or more, 0.43 or more, 0.44 or more, 0.45 or more, 0.48 or more, 0.50 or more, 0.51 or more, 0.52 or more, 0.53 or more, or 0.54 or more, particularly 0.55 or more. When ratio the molar ([SiO.sub.2]+[B.sub.2O.sub.3]+[P.sub.2O.sub.5])/((100[SnO.sub.2])([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O]+[MgO]+[CaO]+[BaO]+[SrO]+[ZnO]+[Al.sub.2O.sub.3])) is too low, a SnO.sub.2 crystal is liable to be precipitated. An upper limit range of the molar ratio ([SiO.sub.2]+[B.sub.2O.sub.3]+[P.sub.2O.sub.5])/((100[SnO.sub.2])([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O]+[MgO]+[CaO]+[BaO]+[SrO]+[ZnO]+[Al.sub.2O.sub.3])) is not particularly limited, but is, for example, 4.0 or less, 3.0 or less, 2.0 or less, 1.5 or less, or 1.0 or less. The molar ratio ([SiO.sub.2]+[B.sub.2O.sub.3]+[P.sub.2O.sub.5])/((100[SnO.sub.2])([Al.sub.2O.sub.3]+[Li.sub.2O]+[Na.sub.2O]+[K.sub.2O]+[MgO]+[CaO]+[BaO]+[SrO]+[ZnO])) refers to a value obtained by dividing the total content of SiO.sub.2, B.sub.2O.sub.3, and P.sub.2O.sub.5 by a value obtained by multiplying a value that is 100 times as large as the content of SnO.sub.2 and the total content of Al.sub.2O.sub.3, Li.sub.2O, Na.sub.2O, K.sub.2O, MgO, CaO, BaO, SrO, and ZnO together.

[0110] A suitable lower limit range of a molar ratio [Li.sub.2O]/([Na.sub.2O]+[K.sub.2O]) is 0.1 or more, 0.3 or more, 0.5 or more, or 0.6 or more, particularly 0.7 or more. When the molar ratio [Li.sub.2O]/([Na.sub.2O]+[K.sub.2O]) is too low, the ion exchange performance may not be sufficiently exhibited. In particular, the efficiency of ion exchange between a Li ion in the glass and a Na ion in the molten salt is liable to be reduced. Meanwhile, when the molar ratio [Li.sub.2O]/([Na.sub.2O]+[K.sub.2O]) is too high, a devitrified crystal is liable to be precipitated in the glass, and it becomes difficult to form the glass into a sheet shape by an overflow down-draw method or the like. Accordingly, a suitable upper limit range of the molar ratio [Li.sub.2O]/([Na.sub.2O]+[K.sub.2O]) is 10 or less, 9 or less, 8.5 or less, 8 or less, 7.5 or less, 7 or less, 6.5 or less, or 6.3 or less, particularly 6 or less. The molar ratio [Li.sub.2O]/([Na.sub.2O]+[K.sub.2O]) refers to a value obtained by dividing the content of Li.sub.2O by the total content of Na.sub.2O and K.sub.2O.

[0111] A Q value calculated by the following equation is a factor correlated to the acid resistance. When the Q value is too low, the acid resistance is liable to be reduced. Accordingly, a suitable lower limit range of the Q value is 30 or more, 25 or more, 20 or more, 18 or more, 15 or more, 12 or more, 10 or more, or 8 or more, particularly 5 or more. Meanwhile, when the Q value is too high, the ion exchange performance may not be sufficiently exhibited. Accordingly, a suitable upper limit range of the Q value is 50 or less, 45 or less, 42 or less, or 40 or less, particularly 35 or less.

[00017] $Q = [{SiO}_{2}] + 1.2 [P_{2} O_{5}] - 3 [{Al}_{2} O_{3}] - [B_{2} O_{3}] - 2 [L i_{2} O] - 1.5 [{Na}_{2} O] - [K_{2} O]$

[0112] A suitable lower limit range of a molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] is 0.1 or more, 0.2 or more, 0.3 or more, 0.40 or more, 0.42 or more, 0.44 or more, 0.50 or more, 0.52 or more, or 0.55 or more, particularly 0.58 or more. When the molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] is too low, the ion exchange performance may not be sufficiently exhibited. In particular, the efficiency of ion exchange between a Li ion in the glass and a Na ion in the molten salt is liable to be reduced. Meanwhile, when the molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] is too high, a devitrified crystal is liable to be precipitated in the glass, and it becomes difficult to form the glass into a sheet shape by an overflow down-draw method or the like. Accordingly, a suitable upper limit range of the molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] is 2.0 or less, 1.8 or less, 1.5 or less, 1.2 or less, 1.0 or less, 0.8 or less, 0.7 or less, or 0.68 or less, particularly 0.60 or less. The molar ratio [Li.sub.2O]/[Al.sub.2O.sub.3] refers to a value obtained by dividing the content of Li.sub.2O by the content of Al.sub.2O.sub.3.

[0113] An X value calculated by the following equation is a factor correlated to an exchange speed between a Li ion and a Na ion. When the X value is too low, the efficiency of ion exchange between a Li ion and a Na ion in the molten salt is reduced, and it becomes difficult to produce a compressive stress. In particular, the depth of compression (DOC.sub.Na) of the compressive stress layer obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt may be reduced. Accordingly, a suitable lower limit range of the X value is 300 or more, 320 or more, 330 or more, 340 or more, 350 or more, 400 or more, 450 or more, 460 or more, 480 or more, 500 or more, or 520 or more, particularly 550 or more. An upper limit range of the X value is not particularly limited, but is, for example, 900 or less or 880 or less.

[00018] $X = - 1.4 9 [S i O_{2}] + 2 6.98 [A l_{2} O_{3}] - 3.2 3 [B_{2} O_{3}] + 48.56 [L i_{2} O] - 24. 31 [N a_{2} O] - 0.28 [M g O] + 2.74 [C a O]$

[0114] A Y value calculated by the following equation is a factor correlated to an exchange speed between a Na ion and a K ion. When the Y value is too low, the efficiency of ion exchange between a Na ion in the glass and a K ion in the molten salt is reduced, and it becomes difficult to produce a compressive stress. In particular, the depth of compression (DOCK) of the compressive stress layer obtained through ion exchange between a Na ion in the glass and a K ion in the molten salt may be reduced. Accordingly, a suitable lower limit range of the Y value is 4 or more, 4.3 or more, 4.5 or more, 4.8 or more, 5 or more, 5.2 or more, 5.5 or more, 6 or more, 7 or more, 8 or more, 9 or more, or 10 or more, particularly 11 or more. An upper limit range of the Y value is not particularly limited, but is, for example, 30 or less or 25 or less.

[00019] $Y = 3 + 0.2 1 [S i O_{2}] + 0.2 5 [A l_{2} O_{3}] - 0.3 3 [B_{2} O_{3}] - 0.55 [L i_{2} O] + 0.4 5 [N a_{2} O] - 0.9 7 [M g O] - 1.4 6 [C a O]$

[0115] A Z value calculated by the following equation is strongly correlated to both the exchange speed between a Li ion and a Na ion and the exchange speed between a Na ion and a K ion, and is a particularly important factor when the glass sheet to be tempered is subjected to ion exchange treatment a plurality of times. When the Z value is too low, the efficiency of ion exchange between a Li ion and a Na ion in the molten salt is liable to be reduced, and also the efficiency of ion exchange between a Na ion and a K ion in the molten salt is liable to be reduced. Thus, it becomes difficult to produce a compressive stress through each of the above-mentioned two kinds of ion exchange. Accordingly, a suitable lower limit range of the Z value is 18 or more, 18.5 or more, 19 or more, 20 or more, 25 or more, 30 or more, 35 or more, or 45 or more, particularly 50 or more. An upper limit range of the Z value is not particularly limited, but is, for example, 120 or less or 100 or less.

[00020] $Z = 0.1 3 [S i O_{2}] + 2.3 6 [A l_{2} O_{3}] - 0.1 4 [B_{2} O_{3}] + 4.9 [L i_{2} O] - 5.53 [N a_{2} O] - 2.1 4 [M g O] - 2.3 4 [C a O]$

[0116] A W value calculated by the following equation is a factor correlated to the Young's modulus. When the W value is too low, the Young's modulus is reduced, and the glass is liable to be broken. Accordingly, a suitable lower limit range of the W value is 250 or more, 300 or more, 330 or more, 340 or more, 350 or more, 360 or more, 370 or more, 400 or more, 430 or more, 450 or more, or 480 or more, particularly 500 or more. An upper limit range of the W value is not particularly limited, but is, for example, 750 or less or 700 or less.

[00021] $W = 0. 0 7 [S i O_{2}] + 18. 17 [A l_{2} O_{3}] - 4.4 2 [B_{2} O_{3}] + 41.43 [L i_{2} O] - 29.3 [N a_{2} O] + 1.4 3 [M g O] - 1 0.4 3 [C a O]$

[0117] A U value calculated by the following equation is a factor correlated to the fracture toughness. When the U value is too low, the fracture toughness value is reduced, and the glass is liable to be broken. Accordingly, a suitable lower limit range of the U value is 7,000 or more, 7,100 or more, 7,500 or more, 7,600 or more, 7,700 or more, 7,750 or more, 7,800 or more, or 7,850 or more, particularly 7,900 or more. An upper limit range of the U value is not particularly limited, but is, for example, 20,000 or less, 18,000 or less, 15,000 or less, 12,000 or less, 10,000 or less, or 9,500 or less.

[00022] $U = 87.39 [S i O_{2}] + 180.12 [A l_{2} O_{3}] + 9 3.6 3 [B_{2} O_{3}] + 113.78 ([M g O] + [C a O] + [B a O] + [S r O]) - 4 6.2 [L i_{2} O] - 7 1 .1 [N a_{2} O] - 58.6 [K_{2} O] - 4 0.0 [P_{2} O_{5}]$

[0118] For example, the following components may be added in addition to the above-mentioned components.

[0119] TiO.sub.2 is a component that improves the ion exchange performance, and is also a component that reduces the viscosity at high temperature. However, when the content of TiO.sub.2 is too large, transparency and the devitrification resistance are liable to be reduced. Accordingly, a suitable content of TiO.sub.2 is from 0% to 10%, from 0% to 5%, from 0% to 3%, from 0% to 1.5%, from 0% to 1%, or from 0% to 0.1%, particularly from 0.001% to 0.1%.

[0120] ZrO.sub.2 is a component that increases the Vickers hardness, and is also a component that increases viscosity around the liquidus viscosity and the strain point. However, when the content of ZrO.sub.2 is too large, the devitrification resistance may be significantly reduced. Accordingly, a suitable content of ZrO.sub.2 is from 0% to 10%, from 0% to 5%, from 0% to 3%, from 0% to 1.5%, from 0% to 1%, from 0% to 0.5%, from 0% to 0.4%, from 0% to 0.3%, or from 0% to 0.2%, particularly from 0% to 0.1%.

[0121] La.sub.2O.sub.3 is a component that increases the Young's modulus and the fracture toughness. However, when the content of La.sub.2O.sub.3 is too large, the liquidus viscosity may be reduced. Accordingly, a suitable content of La.sub.2O.sub.3 is from 0% to 5%, from 0% to 3%, from 0% to 1.5%, from 0% to 1%, from 0% to 0.8%, from 0% to 0.5%, from 0% to 0.4%, from 0% to 0.3%, or from 0% to 0.2%, particularly from 0% to 0.1%.

[0122] Fe.sub.2O.sub.3 is an impurity that is mixed in from raw materials. A suitable upper limit range of the content of Fe.sub.2O.sub.3 is 0.1% or less, 0.08% or less, 0.05% or less, 0.02% or less, or less than 0.015%, less than 0.01%, or less than 0.008%, particularly less than 0.005%. When the content of Fe.sub.2O.sub.3 is too large, the transmittance of a cover glass is liable to be reduced. Meanwhile, a suitable lower limit range of the content of Fe.sub.2O.sub.3 is 0.001% or more, 0.002% or more, or 0.003% or more. When the content of Fe.sub.2O.sub.3 is too small, a raw material cost rises owing to the use of high-purity raw materials, and a product cannot be manufactured inexpensively.

[0123] As a fining agent, SO.sub.3 and/or CeO.sub.2 may be added at from 0.001% to 1%.

[0124] Rare earth oxides, such as Nd.sub.2O.sub.3, Y.sub.2O.sub.3, Nb.sub.2O.sub.5, Ta.sub.2O.sub.5, and Hf.sub.2O.sub.3, are each a component that increases the Young's modulus. However, raw material costs therefor are high. In addition, when the rare earth oxides are each added in a large amount, the devitrification resistance is liable to be reduced. Accordingly, a suitable total content of the rare earth oxides is 5% or less, 4% or less, 3% or less, 2% or less, 1% or less, or 0.5% or less, particularly 0.1% or less, and a suitable content of each of Nd.sub.2O.sub.3, Y.sub.2O.sub.3, Nb.sub.2O.sub.5, Ta.sub.2O.sub.5, and Hf.sub.2O.sub.3 is 3% or less, 2% or less, 1% or less, or 0.5% or less, particularly 0.1% or less.

[0125] The tempered glass sheet and glass sheet to be tempered of the present invention are each preferably substantially free of As.sub.2O.sub.3, Sb.sub.2O.sub.3, PbO, and F as a glass composition from the standpoint of environmental considerations. In addition, the tempered glass sheet and the glass sheet to be tempered are each preferably substantially free of Bi.sub.2O.sub.3 from the standpoint of environmental considerations. The phrase substantially free of has a concept in which the explicit component is not positively added as a glass component, but its addition at an impurity level is permitted, and specifically refers to the case in which the content of the explicit component is less than 0.05%.

[0126] The tempered glass sheet and glass sheet to be tempered of the present invention each preferably have the following characteristics.

[0127] The density () is preferably 2.55 g/cm.sup.3 or less, 2.53 g/cm.sup.3 or less, 2.50 g/cm.sup.3 or less, 2.49 g/cm.sup.3 or less, 2.48 g/cm.sup.3 or less, 2.45 g/cm.sup.3 or less, or from 2.35 g/cm.sup.3 to 2.44 g/cm.sup.3, particularly preferably from 2.25 g/cm.sup.3 to 2.44 g/cm.sup.3. As the density becomes lower, the weight of the tempered glass sheet can be reduced more.

[0128] A thermal expansion coefficient (.sub.30-380 C.) at from 30 C. to 380 C. is preferably 15010.sup.7/ C. or less, 10010.sup.7/ C. or less, from 5010.sup.7/ C. to 9510.sup.7/ C., or from 4010.sup.7/ C. to 8510.sup.7/ C., particularly preferably from 3510.sup.7/ C. to 8010.sup.7/ C. The term thermal expansion coefficient at from 30 C. to 380 C. refers to a value measured for an average thermal expansion coefficient with a dilatometer.

[0129] The softening point (Ts) is preferably 950 C. or less, 940 C. or less, 930 C. or less, 920 C. or less, 910 C. or less, 900 C. or less, 890 C. or less, 880 C. or less, 870 C. or less, 860 C. or less, 850 C. or less, 840 C. or less, 830 C. or less, 820 C. or less, or 810 C. or less, particularly preferably from 700 C. to 800 C. When the softening point is too high, thermal processability may be reduced.

[0130] A temperature (10.sup.2.5 dPa.Math.s) at a viscosity at high temperature of 10.sup.2.5 dPa.Math.s is preferably 1, 680 C. or less, 1, 670 C. or less, 1,660 C. or less, 1,650 C. or less, 1,640 C. or less, 1,630 C. or less, 1,620 C. or less, 1,600 C. or less, 1,550 C. or less, 1,520 C. or less, or 1,500 C. or less, particularly preferably from 1,300 C. to 1, 490 C. When the temperature at a viscosity at high temperature of 10.sup.2.5 dPa.Math.s is too high, the meltability and the formability are reduced, and it becomes difficult to form molten glass into a sheet shape.

[0131] The liquidus viscosity is preferably 10.sup.3.74 dPa.Math.s or more, 10.sup.4.3 dPa.Math.s or more, 10.sup.4.4 dPa.Math.s or more, 10.sup.4.5 dPa.Math.s or more, 10.sup.4.6 dPa.Math.s or more, 10.sup.4.7 dPa.Math.s or more, 10.sup.4.8 dPa.Math.s or more, 10.sup.4.9 dPa.Math.s or more, 10.sup.5.0 dPa.Math.s or more, 10.sup.5.1 dPa.Math.s or more, 10.sup.5.2 dPa.Math.s or more, 10.sup.5.3 dPa.Math.s or more, or 10.sup.5.4 dPa.Math.s or more, particularly preferably 10.sup.5.5 dPa.Math.s or more. As the liquidus viscosity becomes higher, the devitrification resistance is improved more, and devitrified stones are less liable to be generated at the time of forming. The term liquidus viscosity as used herein refers to a value measured for a viscosity at a liquidus temperature by a platinum sphere pull up method.

[0132] The Young's modulus (E) is preferably 60 GPa or more, 65 GPa or more, 70 GPa or more, 71 GPa or more, 72 GPa or more, 73 GPa or more, or 74 GPa or more, particularly preferably 75 GPa or more. When the Young's modulus is low, a cover glass is liable to be deflected when its sheet thickness is small. In addition, an upper limit range of the Young's modulus is not particularly limited, but is substantially 100 GPa or less. The Young's modulus may be calculated by a well-known resonance method.

[0133] The tempered glass sheet of the present invention has a compressive stress layer in a surface thereof. The compressive stress value (CS) of the compressive stress layer on the outermost surface of the tempered glass sheet is preferably 200 MPa or more, 220 MPa or more, 250 MPa or more, 280 MPa or more, 300 MPa or more, 310 MPa or more, 320 MPa or more, 330 MPa or more, 340 MPa or more, 350 MPa or more, 360 MPa or more, 370 MPa or more, 380 MPa or more, 390 MPa or more, 400 MPa or more, 420 MPa or more, or 430 MPa or more, particularly preferably 450 MPa or more. As the compressive stress value (CS) of the compressive stress layer on the outermost surface becomes higher, the Vickers hardness is increased more. Meanwhile, when an excessively large compressive stress is formed in the surface, the internal tensile stress of the tempered glass sheet may be increased excessively, and a dimensional change before and after ion exchange treatment may be increased. Accordingly, the compressive stress value (CS) of the compressive stress layer on the outermost surface is preferably 1,400 MPa or less, 1,200 MPa or less, 1, 100 MPa or less, 1,000 MPa or less, 900 MPa or less, 700 MPa or less, 680 MPa or less, or 650 MPa or less, particularly preferably 600 MPa or less. There is a tendency that the compressive stress value of the compressive stress layer on the outermost surface is increased when an ion exchange time period is shortened, or the temperature of an ion exchange solution is reduced.

[0134] The compressive stress value (CS30) of the tempered glass sheet at a depth of 30 m from the outermost surface is preferably 35 MPa or more, 40 MPa or more, 50 MPa or more, 60 MPa or more, 70 MPa or more, 80 MPa or more, 90 MPa or more, 100 MPa or more, 105 MPa or more, 110 MPa or more, or 115 MPa or more, particularly preferably 120 MPa or more. As the compressive stress value (CS30) at a depth of 30 m from the outermost surface becomes higher, the strength of the tempered glass sheet is increased more. Meanwhile, when an excessively large compressive stress is formed at a depth of 30 m from the outermost surface, the internal tensile stress of the tempered glass sheet may be increased excessively, and a dimensional change before and after the ion exchange treatment may be increased. Accordingly, the compressive stress value (CS30) at a depth of 30 m from the outermost surface is preferably 400 MPa or less, 350 MPa or less, 300 MPa or less, 250 MPa or less, 230 MPa or less, 220 MPa or less, 210 MPa or less, 205 MPa or less, 200 MPa or less, or 195 MPa or less, particularly preferably 190 MPa or less.

[0135] The compressive stress value (CS50) of the tempered glass sheet at a depth of 50 m from the outermost surface is preferably 20 MPa or more, 30 MPa or more, 40 MPa or more, 50 MPa or more, 60 MPa or more, 70 MPa or more, 80 MPa or more, 90 MPa or more, or 95 MPa or more, particularly preferably 100 MPa or more. As the compressive stress value (CS50) at a depth of 50 m from the outermost surface becomes higher, the strength of the tempered glass sheet is increased more. Meanwhile, when an excessively large compressive stress is formed at a depth of 50 m from the outermost surface, the internal tensile stress of the tempered glass sheet may be increased excessively, and a dimensional change before and after the ion exchange treatment may be increased. Accordingly, the compressive stress value (CS50) at a depth of 50 m from the outermost surface is preferably 380 MPa or less, 350 MPa or less, 300 MPa or less, 250 MPa or less, 220 MPa or less, 210 MPa or less, 200 MPa or less, 195 MPa or less, 190 MPa or less, or 180 MPa or less, particularly preferably 170 MPa or less.

[0136] The internal tensile stress value (CT) of the tempered glass sheet is preferably 150 MPa or less, 130 MPa or less, 120 MPa or less, 110 MPa or less, 100 MPa or less, 90 MPa or less, 85 MPa or less, 80 MPa or less, 75 MPa or less, 70 MPa or less, or 60 MPa or less, particularly preferably 50 MPa or less. When the internal tensile stress value is too high, the tempered glass sheet may undergo self-destruction by point collision. An upper limit range of the internal tensile stress value (CT) is not particularly limited, but is substantially 5 m or more.

[0137] The depth of compression of the compressive stress layer of the tempered glass sheet, that is, a depth (DOC) at which the stress value becomes zero is preferably 3 m or more, 5 m or more, 10 m or more, 20 m or more, 30 m or more, 40 m or more, 45 m or more, 50 m or more, 55 m or more, 58 m or more, 60 m or more, 65 m or more, 70 m or more, 75 m or more, 80 m or more, or 85 m or more, particularly preferably 90 m or more. As the depth of compression becomes larger, protrusions or sand grains on a road surface are less liable to reach a tensile stress layer at the time of dropping of a smartphone, and thus the breakage probability of a cover glass can be reduced more. Meanwhile, when the depth of compression is too large, a dimensional change before and after the ion exchange treatment may be increased. Further, there is a tendency that the compressive stress value on the outermost surface is reduced. Accordingly, the depth of compression (DOC) is preferably 200 m or less, 180 m or less, 150 m or less, 140 m or less, 135 m or less, 130 m or less, or 125 m or less, particularly preferably 120 m or less, particularly more preferably 110 m or less. There is a tendency that the depth of compression is increased when the ion exchange time period is prolonged, or the temperature of the ion exchange solution is increased.

[0138] In addition, a compressive stress value (CSK) on the outermost surface, which is obtained through ion exchange between a Na ion in the glass and a K ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a KNO.sub.3 molten salt at 430 C. for 4 hours, is preferably 200 MPa or more, 220 MPa or more, 250 MPa or more, 280 MPa or more, 300 MPa or more, 310 MPa or more, 320 MPa or more, 330 MPa or more, 340 MPa or more, 350 MPa or more, 360 MPa or more, 370 MPa or more, 380 MPa or more, 390 MPa or more, 400 MPa or more, 420 MPa or more, or 430 MPa or more, particularly preferably 450 MPa or more. As the compressive stress value on the outermost surface becomes higher, the Vickers hardness is increased more. Meanwhile, when an excessively large compressive stress is formed in the surface, the internal tensile stress of the tempered glass sheet may be increased excessively, and a dimensional change before and after the ion exchange treatment may be increased. Accordingly, the compressive stress value (CS) on the outermost surface is preferably 1,400 MPa or less, 1,200 MPa or less, 1,100 MPa or less, 1,000 MPa or less, 900 MPa or less, 700 MPa or less, 680 MPa or less, or 650 MPa or less, particularly preferably 600 MPa or less. There is a tendency that the compressive stress value on the outermost surface is increased when the ion exchange time period is shortened, or the temperature of the ion exchange solution is reduced.

[0139] A depth of layer (DOL.sub.K), which is obtained through ion exchange between a Na ion in the glass and a K ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a KNO.sub.3 molten salt at 430 C. for 4 hours, is preferably 3 m or more, 4 m or more, 4.5 m or more, 5 m or more, 6 m or more, 7 m or more, 8 m or more, or 9 m or more, particularly preferably 10 m or more. As the depth of layer becomes larger, protrusions or sand grains on a road surface are less liable to reach the tensile stress layer at the time of dropping of a smartphone, and thus the breakage probability of a cover glass can be reduced more. Meanwhile, when the depth of layer is too large, a dimensional change before and after the ion exchange treatment may be increased. Further, there is a tendency that the compressive stress value on the outermost surface is reduced. Accordingly, the depth of layer (DOL.sub.K) is preferably 40 m or less, 35 m or less, 30 m or less, 28 m or less, 25 m or less, 23 m or less, or 20 m or less, particularly preferably 18 m or less. There is a tendency that the depth of layer is increased when the ion exchange time period is prolonged, or the temperature of the ion exchange solution is increased.

[0140] Further, a compressive stress value (CS.sub.Na) on the outermost surface, which is obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour, is preferably 140 MPa or more, 150 MPa or more, 160 MPa or more, 170 MPa or more, 180 MPa or more, or 190 MPa or more, particularly preferably 200 MPa or more. As the compressive stress value on the outermost surface becomes higher, the strength of the tempered glass sheet is increased more. Meanwhile, when an excessively large compressive stress is formed in the surface, the internal tensile stress of the tempered glass sheet is increased excessively, and a dimensional change before and after the ion exchange treatment may be increased. Accordingly, the compressive stress value (CS.sub.Na) of the compressive stress layer on the outermost surface is preferably 650 MPa or less, 630 MPa or less, 600 MPa or less, 580 MPa or less, 560 MPa or less, 550 MPa or less, 540 MPa or less, 530 MPa or less, 500 MPa or less, 480 MPa or less, 450 MPa or less, 430 MPa or less, 400 MPa or less, or 380 MPa or less, particularly preferably 350 MPa or less.

[0141] A compressive stress value (CS30Na) at a depth of 30 m from the outermost surface, which is obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour, is preferably 35 MPa or more, 40 MPa or more, 50 MPa or more, 60 MPa or more, 70 MPa or more, 80 MPa or more, 90 MPa or more, 100 MPa or more, 105 MPa or more, 110 MPa or more, or 115 MPa or more, particularly preferably 120 MPa or more. As the compressive stress value (CS30Na) at a depth of 30 m from the outermost surface becomes higher, the strength of the tempered glass sheet is increased more. Meanwhile, when an excessively large compressive stress is formed at a depth of 30 m from the outermost surface, the internal tensile stress of the tempered glass sheet is increased excessively, and a dimensional change before and after the ion exchange treatment may be increased. Accordingly, the compressive stress value (CS30Na) at a depth of 30 m from the outermost surface is preferably 400 MPa or less, 350 MPa or less, 300 MPa or less, 250 MPa or less, 230 MPa or less, 220 MPa or less, 210 MPa or less, 205 MPa or less, 200 MPa or less, or 195 MPa or less, particularly preferably 190 MPa or less.

[0142] A depth of compression (DOC.sub.Na), which is obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour, is preferably 3 m or more, 5 m or more, 10 m or more, 20 m or more, 30 m or more, 40 m or more, 45 m or more, 50 m or more, 55 m or more, 58 m or more, 60 m or more, 65 m or more, 70 m or more, 75 m or more, 80 m or more, or 85 m or more, particularly preferably 90 m or more. As the depth of compression becomes larger, protrusions or sand grains on a road surface are less liable to reach the tensile stress layer at the time of dropping of a smartphone, and thus the breakage probability of the cover glass can be reduced more. Meanwhile, when the depth of compression is too large, a dimensional change before and after the ion exchange treatment may be increased. Further, there is a tendency that the compressive stress value of the compressive stress layer on the outermost surface is reduced. Accordingly, the depth of compression (DOC.sub.Na) is preferably 200 m or less, 180 m or less, 150 m or less, 140 m or less, 130 m or less, or 120 m or less, particularly preferably 110 m or less. There is a tendency that the depth of compression is increased when the ion exchange time period is prolonged, or the temperature of the ion exchange solution is increased.

[0143] An internal tensile stress value (CTcv.sub.Na), which is obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour, is preferably 150 MPa or less, 130 MPa or less, 120 MPa or less, 110 MPa or less, 100 MPa or less, 90 MPa or less, 85 MPa or less, 80 MPa or less, 75 MPa or less, 70 MPa or less, or 60 MPa or less, particularly preferably 50 MPa or less. When the internal tensile stress value is too high, the tempered glass sheet may undergo self-destruction by point collision. An upper limit range of the internal tensile stress value (CTcv.sub.Na) is not particularly limited, but is substantially 5 m or more.

[0144] A ratio DOC.sub.Na/DOL.sub.K between the depth of compression (DOC.sub.Na), which is obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour, and the depth of layer (DOL.sub.K), which is obtained through ion exchange between a Na ion in the glass and a K ion in the molten salt when the glass sheet to be tempered is subjected to ion exchange treatment by being immersed in a KNO.sub.3 molten salt at 430 C. for 4 hours, is preferably 15 or less, 12 or less, 10 or less, 9 or less, 8 or less, 7.5 or less, 7.0 or less, 6.5 or less, 6.0 or less, 5.5 or less, 5.0 or less, or 4.5 or less. When the ratio DOC.sub.Na/DOL.sub.K is too high, the compressive stress value (CS30) of the tempered glass sheet, which has been subjected to two-step tempering by being immersed in a NaNO.sub.3 molten salt and then immersed in a KNO.sub.3 molten salt, at a depth of 30 m from the outermost surface may be reduced. Meanwhile, when the ratio DOC.sub.Na/DOL.sub.K is too low, a time period required for ion exchange between a Li ion in the glass and a Na ion in the molten salt may be excessively prolonged.

[0145] A mass loss of the tempered glass sheet of the present invention per unit surface area when the tempered glass sheet is immersed in a 5 mass % HCl aqueous solution warmed to 80 C. for 24 hours is preferably 2.0 mg/cm.sup.2 or less, 1.5 mg/cm.sup.2 or less, 1.0 mg/cm.sup.2 or less, or 0.8 mg/cm.sup.2 or less, particularly preferably 0.5 mg/cm.sup.2 or less. The tempered glass sheet may be brought into contact with an acidic chemical solution depending on a use environment of a device, and hence preferably has high acid resistance from the viewpoint of preventing a failure of the device.

[0146] In addition, a mass loss of the tempered glass sheet per unit surface area when the tempered glass sheet is immersed in a 5 mass % NaOH aqueous solution warmed to 80 C. for 6 hours is preferably 5.0 mg/cm.sup.2 or less, 4.5 mg/cm.sup.2 or less, 4.0 mg/cm.sup.2 or less, 3.5 mg/cm.sup.2 or less, or 3.0 mg/cm.sup.2 or less, particularly preferably 2.0 mg/cm.sup.2 or less. The tempered glass sheet may be brought into contact with an alkaline chemical solution or a detergent depending on a use environment of a device, and is hence required to have high alkali resistance.

[0147] The fracture toughness K1c is preferably 0.75 MPa.Math.m.sup.0.5 or more, 0.78 MPa.Math.m.sup.0.5 or more, 0.79 MPa.Math.m.sup.0.5 or more, 0.80 MPa.Math.m.sup.0.5 or more, or 0.81 MPa.Math.m.sup.0.5 or more, particularly preferably 0.82 MPa.Math.m.sup.0.5 or more. When the fracture toughness K1c is low, the tempered glass sheet is liable to be broken. The upper limit of the fracture toughness is not particularly limited, but is realistically 10 MPa.Math.m0.5 or less.

[0148] The fracture energy is energy per unit fracture area consumed at the time of fracture, and is energy calculated by the equation: =(K1c).sup.2/E. The fracture energy is preferably 5.0 J/m.sup.2 or more, 5.5 J/m.sup.2 or more, 6.0 J/m.sup.2 or more, 6.5 J/m.sup.2 or more, 7.0 J/m.sup.2 or more, 7.5 J/m.sup.2 or more, or 7.8 J/m.sup.2 or more, particularly preferably 8.0 J/m.sup.2 or more. When the fracture energy is low, the tempered glass sheet is liable to be shattered at the time of breakage, and it becomes difficult to secure safety. The upper limit of the fracture energy is not particularly limited, but is realistically 30 J/m.sup.2 or less.

[0149] The abraded four-point bending strength of the tempered glass sheet of the present invention is preferably 150 MPa or more, 160 MPa or more, 170 MPa or more, 175 MPa or more, 180 MPa or more, 185 MPa or more, 190 MPa or more, or 195 MPa or more, particularly preferably 200 MPa or more. When the abraded four-point bending strength is too low, the tempered glass sheet is liable to be broken at the time of dropping when used as a cover glass of a smartphone. The upper limit of the abraded four-point bending strength is not particularly limited, but is realistically 1,500 MPa or less.

[0150] The tempered glass sheet of the present invention has a thickness of preferably 2.0 mm or less, 1.5 mm or less, 1.3 mm or less, 1.1 mm or less, 1.0 mm or less, or 0.9 mm or less, particularly preferably 0.8 mm or less. As the thickness becomes smaller, the mass of the tempered glass sheet can be reduced more. Meanwhile, when the thickness is too small, it becomes difficult to obtain desired mechanical strength. Accordingly, the thickness is preferably 0.03 mm or more, 0.05 mm or more, 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, 0.4 mm or more, 0.5 mm or more, or 0.6 mm or more, particularly preferably 0.7 mm or more.

[0151] A method of manufacturing a tempered glass sheet of the present invention comprises: a preparation step of preparing a glass sheet to be tempered including as a glass composition, in terms of mol %, 50% to 80% of SiO.sub.2, 7% to 25% of Al.sub.2O.sub.3, 0% to 15% of B.sub.2O.sub.3, 0% to 15% of Li.sub.2O, 0% to 25% of Na.sub.2O, 0% to 10% of K.sub.2O, 0% to 15% of MgO, 0% to 10% of CaO, 0% to 10% of BaO, 0% to 10% of SrO, 0% to 10% of ZnO, 0% to 15% of P.sub.2O.sub.5, 0% to 10% of TiO.sub.2, 0% to 10% of ZrO.sub.2, and 0% to 0.30% of SnO.sub.2, having a value of [B.sub.2O.sub.3]+[MgO]+[CaO] of from 0.1% to 30%, and having a value of ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3] of from 0.5 to 2.0; and an ion exchange step of subjecting the glass sheet to be tempered to ion exchange treatment to provide a tempered glass sheet having a compressive stress layer in a surface thereof. The method of manufacturing a tempered glass sheet of the present invention encompasses not only the case of performing the ion exchange treatment a plurality of times, but also the case of performing the ion exchange treatment only once.

[0152] The method of manufacturing a glass to be tempered is, for example, as described below. As a preferred method, first, glass raw materials blended so as to give a desired glass composition are loaded into a continuous melting furnace, are heated to be melted at from 1,400 C. to 1,700 C., and are fined. After that, the molten glass is supplied to a forming apparatus and formed into a sheet shape, followed by cooling. A well-known method may be adopted as a method of cut processing, into predetermined dimensions, the glass having been formed into a sheet shape.

[0153] A method of forming the molten glass into a sheet shape is preferably an overflow down-draw method. In the overflow down-draw method, a glass sheet to be obtained has an overflow-merged surface parallel to a main surface in the inside thereof, and a surface to serve as the surface of the glass sheet is not brought into contact with the surface of the forming body refractory, and is formed into a sheet shape in a state of a free surface. Thus, a glass sheet having satisfactory surface quality can be manufactured inexpensively without polishing. Further, in the overflow down-draw method, alumina-based refractory, zircon-based refractory, or zirconia-based refractory is used as the forming body refractory. Moreover, the tempered glass sheet and the glass sheet to be tempered of the present invention each have good compatibility with the alumina-based refractory or the zirconia-based refractory (particularly the alumina-based refractory), and hence have a property of hardly generating bubbles, stones, or the like through a reaction with the refractory.

[0154] Various forming methods may be adopted in addition to the overflow down-draw method. For example, forming methods, such as a float method, a down-draw method (e.g., a slot down-draw method or a re-draw method), a roll out method, and a press method, may be adopted.

[0155] At the time of forming of the molten glass, the molten glass is preferably cooled in a temperature region of from the annealing point of the molten glass to the strain point thereof at a cooling rate of 3 C./min or more and less than 1,000 C./min. A lower limit range of the cooling rate is preferably 10 C./min or more, 20 C./min or more, or 30 C./min or more, particularly preferably 50 C./min or more, and an upper limit range thereof is preferably less than 1,000 C./min or less than 500 C./min, particularly preferably less than 300 C./min. When the cooling rate is too high, the structure of the glass becomes coarse, and it becomes difficult to increase the Vickers hardness after the ion exchange treatment. Meanwhile, when the cooling rate is too low, the production efficiency of the glass sheet is reduced.

[0156] In the method of manufacturing a tempered glass sheet of the present invention, the ion exchange treatment may be performed a plurality of times. As the ion exchange treatment performed a plurality of times, it is preferred to perform ion exchange treatment in which the glass sheet to be tempered is immersed in a molten salt containing a KNO.sub.3 molten salt and/or a NaNO.sub.3 molten salt, and then perform ion exchange treatment in which the glass sheet to be tempered is immersed in a molten salt containing a KNO.sub.3 molten salt and/or a NaNO.sub.3 molten salt. With this configuration, the compressive stress value of the compressive stress layer on the outermost surface can be increased while a large depth of compression is ensured.

[0157] In particular, in the method of manufacturing a tempered glass sheet of the present invention, it is preferred to perform ion exchange treatment (first ion exchange step) in which the glass sheet to be tempered is immersed in a NaNO.sub.3 molten salt or a mixed molten salt of NaNO.sub.3 and KNO.sub.3, and then perform ion exchange treatment (second ion exchange step) in which the glass sheet to be tempered is immersed in a mixed molten salt of KNO.sub.3 and LiNO.sub.3. With this configuration, a non-monotonic stress profile (stress distribution of the glass sheet in a thickness direction) as illustrated in FIG. 1 is easily formed. FIG. 1 is a schematic view of a stress profile obtained by measuring a stress of the tempered glass sheet from a surface in a depth direction, with a compressive stress being a positive number and a tensile stress being a negative number. FIG. 2 is an enlarged view of a low compressive stress region in the stress profile of FIG. 1. Specifically, the stress profile having the first peak a, the first bottom b, the second peak c, and the second bottom d can be formed. As a result, the breakage probability of a cover glass can be significantly reduced at the time of dropping of a smartphone.

[0158] In the present invention, the first peak, the first bottom, the second peak, and the second bottom are defined as described below. Herein, a at which the compressive stress becomes the maximum value on the surface is defined as the first peak, b at which the stress becomes the local minimum value after having been gradually reduced from the first peak in the depth direction is defined as the first bottom, c at which the compressive stress becomes the local maximum value after having been gradually increased from the first bottom in the depth direction is defined as the second peak, and d at which the tensile stress becomes the minimum value after having been gradually reduced from the second peak in the depth direction is defined as the second bottom.

[0159] In the first ion exchange step, a Li ion in the glass and a Na ion in the molten salt are ion exchanged with each other, and in the case of using the mixed molten salt of NaNO.sub.3 and KNO.sub.3, a Na ion in the glass and a K ion in the molten salt are further ion exchanged with each other. In this case, the ion exchange between a Li ion in the glass and a Na ion in the molten salt is faster and more efficient than the ion exchange between a Na ion in the glass and a K ion in the molten salt. In the second ion exchange step, a Na ion in the vicinity of the glass surface (a shallow region from the outermost surface to 20% of a sheet thickness) and a Li ion in the molten salt are ion exchanged with each other, and besides, a Na ion in the vicinity of the glass surface (the shallow region from the outermost surface to 20% of the sheet thickness) and a K ion in the molten salt are ion exchanged with each other. That is, in the second ion exchange step, while a Na ion in the vicinity of the glass surface is released, a K ion, which has a large ionic radius, can be introduced. As a result, the compressive stress value of the compressive stress layer on the outermost surface can be increased while a large depth of compression is maintained.

[0160] In the first ion exchange step, the temperature of the molten salt is preferably from 360 C. to 400 C., and the ion exchange time period is preferably from 30 minutes to 10 hours. In the second ion exchange step, the temperature of the ion exchange solution is preferably from 370 C. to 400 C., and the ion exchange time period is preferably from 15 minutes to 3 hours.

[0161] In order to form the non-monotonic stress profile, it is preferred that the concentration of NaNO.sub.3 be higher than the concentration of KNO.sub.3 in the mixed molten salt of NaNO.sub.3 and KNO.sub.3 to be used in the first ion exchange step, and that the concentration of KNO.sub.3 be higher than the concentration of LiNO.sub.3 in the mixed molten salt of KNO.sub.3 and LiNO.sub.3 to be used in the second ion exchange step.

[0162] In the mixed molten salt of NaNO.sub.3 and KNO.sub.3 to be used in the first ion exchange step, the concentration of KNO.sub.3 is preferably 0 mass % or more, 0.5 mass % or more, 1 mass % or more, 5 mass % or more, 7 mass % or more, 10 mass % or more, or 15 mass % or more, particularly preferably from 20 mass % to 90 mass %. When the concentration of KNO.sub.3 is too high, the compressive stress value obtained through ion exchange between a Li ion in the glass and a Na ion in the molten salt may be excessively reduced. In addition, when the concentration of KNO.sub.3 is too low, measurement of a stress with a surface stress meter FSM-6000 may become difficult.

[0163] In the mixed molten salt of KNO.sub.3 and LiNO.sub.3 to be used in the second ion exchange step, the concentration of LiNO.sub.3 is preferably from 0 mass % to 5 mass %, from 0.1 mass % to 3 mass %, or from 0.15 mass % to 2 mass %, particularly preferably from 0.2 mass % to 1.5 mass %. When the concentration of LiNO.sub.3 is too low, it becomes difficult to release a Na ion in the vicinity of the glass surface. Meanwhile, when the concentration of LiNO.sub.3 is too high, the compressive stress value obtained through ion exchange between a Na ion in the vicinity of the glass surface and a K ion in the molten salt may be excessively reduced.

[0164] A molten salt of 100% KNO.sub.3 free of LiNO.sub.3 may be used as the molten salt to be used in the second ion exchange step. In this case, an inflected stress profile without the first bottom b and the second peak c, specifically, a stress profile having an inflection point e as illustrated in FIG. 3 is easily obtained.

[0165] In addition, in the method of manufacturing a tempered glass sheet of the present invention, ion exchange treatment in which the glass sheet to be tempered is immersed in the mixed molten salt of NaNO.sub.3 and KNO.sub.3 once, and the second ion exchange step is not performed may be used. When the above-mentioned ion exchange treatment is performed, the stress profile having an inflection point (e of FIG. 3) can be efficiently formed. When the stress profile having the inflection point e is formed, a glass having a high compressive stress on the surface and a large depth of compression is easily obtained. For example, when the stress profile can be approximated to a polyline formed of two straight lines, the inflection point e may be determined as a point on the stress profile at a depth corresponding to the intersection point between the two straight lines (inflection point of the polyline). For example, a well-known method such as a least squares method may be used for the approximation of a line.

[0166] The depth (De) of the inflection point e is preferably a shallow position closer to the surface. Specifically, the depth (De) of the inflection point e is preferably 30 m or less, 25 m or less, or 20 m or less, particularly preferably 18 m or less from the surface. Meanwhile, when the depth (De) of the inflection point e is too small, protrusions or sand grains on a road surface may be liable to reach the tensile stress layer at the time of dropping of a smartphone. Accordingly, the depth (De) of the inflection point e is preferably 3 m or more, 4 m or more, or 4.5 m or more, particularly preferably 5 m or more. In addition, the compressive stress at the inflection point is preferably 80 MPa or more, particularly preferably 100 MPa or more.

[0167] A suitable upper limit range of a Na ion (substantially, Na ion-Li ion) mutual diffusion coefficient D.sub.Na at 380 C. is 110.sup.11 m.sup.2 sec.sup.1 or less, 0.810.sup.11 m.sup.2 sec.sup.1 or less, 0.510.sup.11 m.sup.2 sec.sup.1 or less, or 110.sup.12 m.sup.2 sec.sup.1 or less. When the mutual diffusion coefficient D.sub.Na is too high, the diffusion of a Na ion is too fast, and the compressive stress value of the glass sheet in a relatively deep region in a thickness direction is liable to be reduced. Meanwhile, a suitable lower limit range of the Na ion mutual diffusion coefficient D.sub.Na is 110.sup.14 m.sup.2 sec.sup.1 or more, 0.510.sup.13 m.sup.2 sec.sup.1 or more, 110.sup.13 m.sup.2 sec.sup.1 or more, 210.sup.13 m.sup.2 sec.sup.1 or more, 310.sup.13 m.sup.2 sec.sup.1 or more, or 510.sup.13 m.sup.2 sec.sup.1 or more, particularly 810.sup.13 m.sup.2 sec.sup.1 or more. When the Na ion mutual diffusion coefficient D.sub.Na is too low, a Na ion hardly diffuses, and it becomes difficult to obtain a large depth of compression (DOC). In addition, mutual diffusion between a Na ion and a Li ion hardly occurs, and it becomes difficult to form the non-monotonic stress profile.

[0168] A suitable upper limit range of a K ion (substantially, K ion-Na ion) mutual diffusion coefficient D.sub.K at 380 C. is 110.sup.14 m.sup.2 sec.sup.1 or less, 0.810.sup.14 m.sup.2 sec.sup.1 or less, 0.510.sup.14 m.sup.2 sec.sup.1 or less, 110.sup.15 m.sup.2 sec.sup.1 or less, 0.810.sup.15 m.sup.2 sec.sup.1 or less, 0.510.sup.15 m.sup.2 sec.sup.1 or less, or 0.310.sup.15 m.sup.2 sec.sup.1 or less, particularly 0.210.sup.15 m.sup.2 sec.sup.1 or less. When the K ion mutual diffusion coefficient D.sub.K is too high, the diffusion of a K ion is too fast, and the compressive stress value of the glass sheet in a relatively shallow region in the thickness direction is liable to be reduced. Meanwhile, a suitable lower limit range of the K ion mutual diffusion coefficient D.sub.K is 110.sup.17 m.sup.2 sec.sup.1 or more, 0.510.sup.16 m.sup.2 sec.sup.1 or more, 110.sup.16 m.sup.2 sec.sup.1 or more, 210.sup.16 m.sup.2 sec.sup.1 or more, 310.sup.16 m.sup.2 sec.sup.1 or more, 510.sup.16 m.sup.2 sec.sup.1 or more, or 710.sup.16 m.sup.2 sec.sup.1 or more, particularly 810.sup.16 m.sup.2 sec.sup.1 or more. When the K ion mutual diffusion coefficient D.sub.K is too low, a K ion hardly diffuses, and the depth of layer (DOL.sub.K) of the compressive stress layer obtained through ion exchange with a K ion may be reduced.

[0169] A suitable lower limit range of a mutual diffusion coefficient ratio D.sub.K/D.sub.Na at 380 C. is 0.0001 or more, 0.0003 or more, 0.0005 or more, 0.0008 or more, 0.0010 or more, 0.0012 or more, 0.0013 or more, 0.0014 or more, 0.0015 or more, 0.0016 or more, or 0.0017 or more, particularly 0.0018 or more. When the ratio D.sub.K/D.sub.Na is too low, the diffusion speed of a K ion is too slow with respect to the diffusion speed of a Na ion, and hence the Na ion excessively diffuses in the deep region, with the result that the compressive stress value (CS30Na) at a depth of 30 m may be reduced. The upper limit of the ratio D.sub.K/D.sub.Na is 0.0100 or less, 0.0080 or less, 0.0050 or less, 0.0040 or less, or 0.0030 or less. When the ratio D.sub.K/D.sub.Na is too low, it becomes difficult to form the non-monotonic stress profile.

[0170] The Na ion mutual diffusion coefficient D.sub.Na at 380 C. may be calculated by using the following equation of [Math. 1] based on a Na ion concentration profile (concentration distribution) in the thickness direction of the tempered glass sheet having been subjected to ion exchange with a molten salt of NaNO.sub.3 (100%) at 380 C. In the equation of [Math. 1], the diffusion coefficient is defined assuming that an alkali metal ion to be ion exchanged diffuses in the glass according to a complementary error function, which is an analytical solution of a diffusion equation. The Na ion concentration profile may be obtained by using EPMA measurement of a cross section of the tempered glass sheet. In the equation of [Math. 1], x represents a depth from the surface, C(x) represents a concentration at a depth of x, C.sub.min represents a minimum concentration, C.sub.max represents a maximum concentration, t represents a diffusion time period, and D represents the mutual diffusion coefficient. The mutual diffusion coefficient D may be determined as a solution by substituting the results of the EPMA measurement into the equation of [Math. 1], and performing an operation assuming that the results of the measurement fit to the complementary error function. The diffusion time period t substantially coincides with the ion exchange time period.

[00023] $[Math . 1]$ $\frac{C (x) - C_{\min}}{C_{\max} - C_{\min}} = erfc (\frac{x}{\sqrt{4 \tilde{D} t}})$

[0171] The K ion mutual diffusion coefficient D.sub.K at 380 C. may be calculated by using the above-mentioned equation of [Math. 1] based on a K ion concentration profile (concentration distribution) in the thickness direction of the tempered glass sheet having been subjected to ion exchange with a molten salt of KNO.sub.3 (100%) at 380 C. The K ion concentration profile may be obtained by using EPMA measurement of a cross section of the tempered glass sheet.

[0172] The Na ion mutual diffusion coefficient D.sub.Na and K ion mutual diffusion coefficient D.sub.K at 380 may each be calculated based on the ion concentration profile and the equation of [Math. 1] as described above, but may be obtained as follows: the tempered glass sheet having been subjected to ion exchange is subjected to heat treatment (annealing) at 380 C., and the diffusion coefficient is calculated from a difference in concentration before and after the heat treatment. A heat treatment time period is not particularly limited, but is 1 minute or more, 5 minutes or more, 10 minutes or more, or 20 minutes or more, particularly from 30 minutes to 120 minutes.

[0173] When two-step ion a exchange is performed, compressive stress value (CS30.sub.2nd) at a depth of 30 m after second ion exchange is lower than a compressive stress value (CS30.sub.1st) at a depth of 30 m after first ion exchange in some cases. A compressive stress drop rate (CS30Droprate) at a depth of 30 m before and after the second ion exchange in such cases is represented by the following equation of [Math. 2]. A suitable upper limit range of the CS30Droprate is 1.00 or less, 0.70 or less, 0.50 or less, 0.45 or less, 0.40 or less, 0.35 or less, 0.32 or less, 0.30 or less, 0.28 or less, or 0.25 or less, particularly 0.20 or less. When the CS30Droprate is low, the CS30.sub.2nd is increased, and the strength of the tempered glass sheet is easily increased. Meanwhile, the lower limit thereof is not particularly limited, but is 0.05 or more or 0.10 or more, particularly 0.15 or more.

[00024] $[Math . 2]$ $CS 30_{Drop rate} = \frac{CS 30_{2 nd} - CS 30_{1 st}}{CS 30_{1 st}}$

EXAMPLES

[0174] The present invention is described below by way of Examples. The following Examples are merely illustrative. The present invention is by no means limited to the following Examples.

EXAMPLE 1

[0175] The glass compositions and glass characteristics of Examples of the present invention (Samples Nos. 001 to 102 and Nos. 104 to 285) and Comparative Example (Sample No. 103) are shown in Tables 1 to 30. In each of the tables, the term N.A. means not applicable, and the term R.sub.2O/Al.sub.2O.sub.3 means the molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3].

TABLE-US-00001 TABLE 1 No. No. No. No. No. No. No. No. No. No. Component (mol %) 001 002 003 004 005 006 007 008 009 010 SiO.sub.2 69.867 69.863 69.862 69.866 69.859 69.854 69.962 65.864 65.862 65.865 Al.sub.2O.sub.3 10.0 10.0 10.0 10.0 10.0 10.0 10.0 12.0 12.0 12.0 B.sub.2O.sub.3 10.0 0.0 0.0 5.0 0.0 5.0 3.3 10.0 0.0 5.0 Li.sub.2O 8.0 8.0 8.0 8.0 8.0 8.0 8.0 9.6 9.6 9.6 Na.sub.2O 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.4 2.4 2.4 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 10.0 0.0 5.0 5.0 0.0 3.3 0.0 0.0 5.0 CaO 0.0 0.0 10.0 0.0 5.0 5.0 3.3 0.0 10.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.001 0.002 0.001 0.002 0.001 0.001 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.001 0.003 0.003 0.001 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.001 0.001 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.001 0.002 0.004 0.001 0.007 0.012 0.004 0.002 0.004 0.001 B.sub.2O.sub.3 + MgO + CaO 10.0 10.0 10.0 10.0 10.0 10.0 9.9 10.0 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 20.0 20.0 20.0 20.0 20.0 20.0 20.0 24.0 24.0 24.0 R.sub.2O/Al.sub.2O.sub.3 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.00 0.50 0.50 0.67 0.50 0.67 0.60 1.00 0.55 0.71 Na.sub.2O/Li.sub.2O 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Li.sub.2O/Al.sub.2O.sub.3 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 Q 10.87 20.86 20.86 15.87 20.86 15.85 17.66 2.94 7.06 2.07 X 473 503 533 488 518 503 503 601 661 616 Y 13 7 2 10 5 8 8 12 1 9 Z 59 39 37 49 38 48 46 69 47 59 W 415 474 355 444 414 385 415 506 446 535 U 8,331 8,533 8,532 8,432 8,532 8,431 8,463 8,239 8,441 8,340 (g/cm.sup.3) 2.280 2.419 2.472 2.354 2.445 2.393 2.397 2.304 2.493 2.378 Ts ( C.) 807 N.A. 792 816 N.A. 795 764 805 775 795 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,610 1,524 1,470 1,569 1,501 1,538 1,529 1,550 1,414 1,491 E (GPa) 67 84 85 77 N.A. N.A. N.A. 70 N.A. 79 CS.sub.K (MPa) 503 915 N.A. 703 N.A. N.A. 868 596 N.A. N.A. DOL.sub.K (m) 12 6 N.A. 8 N.A. N.A. 5 12 N.A. N.A. CS.sub.Na (MPa) 391 390 243 371 349 305 338 495 307 358 CS30.sub.Na (MPa) 116 120 46 106 74 65 91 163 58 83 DOC.sub.Na (m) 57 58 47 56 49 49 55 61 47 51 CTcv.sub.Na (MPa) 30 34 19 31 26 22 26 40 22 27 DOC.sub.Na/DOL.sub.K 4.8 9.6 N.A. 7.0 N.A. N.A. 10.9 5.1 N.A. N.A. Acid resistance 0.04 0.03 0.03 0.06 N.A. N.A. N.A. 0.32 0.01 0.05 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance 1.20 0.30 0.30 0.70 N.A. N.A. N.A. 1.30 0.20 1.60 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00002 TABLE 2 No. No. No. No. No. No. No. No. No. No. Component (mol %) 011 012 013 014 015 016 017 018 019 020 SiO.sub.2 65.866 65.866 65.966 73.864 73.864 73.856 73.866 73.866 73.859 73.955 Al.sub.2O.sub.3 12.0 12.0 12.0 8.0 8.0 8.0 8.0 8.0 8.0 8.0 B.sub.2O.sub.3 0.0 5.0 3.3 10.0 0.0 0.0 5.0 0.0 5.0 3.3 Li.sub.2O 9.6 9.6 9.6 6.4 6.4 6.4 6.4 6.4 6.4 6.4 Na.sub.2O 2.4 2.4 2.4 1.6 1.6 1.6 1.6 1.6 1.6 1.6 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 5.0 0.0 3.3 0.0 10.0 0.0 5.0 5.0 0.0 3.3 CaO 5.0 5.0 3.3 0.0 0.0 10.0 0.0 5.0 5.0 3.3 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.000 0.000 0.000 0.002 0.002 0.010 0.000 0.000 0.007 0.011 B.sub.2O.sub.3 + MgO + CaO 10.0 10.0 9.9 10.0 10.0 10.0 10.0 10.0 10.0 9.9 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 24.0 24.0 24.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0 R.sub.2O/Al.sub.2O.sub.3 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.55 0.71 0.65 1.00 0.44 0.44 0.62 0.44 0.62 0.55 Na.sub.2O/Li.sub.2O 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Li.sub.2O/Al.sub.2O.sub.3 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.80 Q 7.07 2.07 3.87 24.66 34.66 34.66 29.67 34.67 29.66 31.46 X 646 631 631 345 375 405 360 390 375 375 Y 3 7 7 14 8 3 11 6 9 9 Z 48 58 55 50 30 28 40 29 39 36 W 505 476 506 325 383 265 354 324 295 325 U 8,441 8,340 8,372 8,423 8,624 8,624 8,524 8,624 8,523 8,554 (g/cm.sup.3) 2.469 2.414 2.420 2.256 2.390 2.446 2.328 2.420 2.369 2.373 Ts ( C.) N.A. 756 N.A. 821 N.A. 817 837 N.A. N.A. N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,440 1,470 1,468 1,670 1,604 1,528 1,626 1,572 1,584 1,602 E (GPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. CS.sub.K (MPa) 986 N.A. N.A. 412 712 N.A. 573 N.A. 682 664 DOL.sub.K (m) 7 N.A. N.A. 12 7 N.A. 9 N.A. 5 6 CS.sub.Na (MPa) 554 417 459 275 276 202 262 261 226 261 CS30.sub.Na (MPa) 167 92 107 87 96 41 86 64 54 70 DOC.sub.Na (m) 58 51 52 60 62 48 60 52 52 54 CTcv.sub.Na (MPa) 44 27 32 20 27 15 23 20 17 21 DOC.sub.Na/DOL.sub.K 8.0 N.A. N.A. 5.0 9.4 N.A. 6.7 N.A. 9.8 9.5 Acid resistance N.A. N.A. N.A. 0.03 0.00 0.00 N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. 1.20 0.20 0.30 N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00003 TABLE 3 No. No. No. No. No. No. No. No. No. No. Component (mol %) 021 022 023 024 025 026 027 028 029 030 SiO.sub.2 73.866 73.866 73.855 73.854 73.854 73.863 73.862 69.863 69.865 69.865 Al.sub.2O.sub.3 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 9.0 B.sub.2O.sub.3 6.0 0.0 0.0 3.0 0.0 3.0 2.0 10.0 0.0 10.0 Li.sub.2O 8.0 8.0 8.0 8.0 8.0 8.0 8.0 7.0 7.0 8.0 Na.sub.2O 2.0 2.0 2.0 2.0 2.0 2.0 2.0 3.0 3.0 3.0 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 6.0 0.0 3.0 3.0 0.0 2.0 0.0 10.0 0.0 CaO 0.0 0.0 6.0 0.0 3.0 3.0 2.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.000 0.000 0.011 0.012 0.012 0.003 0.004 0.003 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 6.0 6.0 6.0 6.0 6.0 6.0 6.0 10.0 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 R.sub.2O/Al.sub.2O.sub.3 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.22 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.00 0.63 0.63 0.77 0.63 0.77 0.71 1.00 0.50 0.82 Na.sub.2O/Li.sub.2O 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.43 0.43 0.38 Li.sub.2O/Al.sub.2O.sub.3 0.80 0.80 0.80 0.80 0.80 0.80 0.80 0.70 0.70 0.89 Q 18.87 24.87 24.86 21.85 24.85 21.86 22.86 11.36 21.37 12.37 X 480 498 516 489 507 498 498 400 430 422 Y 16 12 9 14 10 12 12 14 8 14 Z 61 49 47 55 48 54 52 49 29 52 W 433 468 397 451 433 415 433 345 403 368 U 8,306 8,427 8,426 8,366 8,426 8,367 8,387 8.306 8,508 8,080 (g/cm.sup.3) 2.299 2.377 2.414 2.341 2.397 2.366 2.368 2.282 2.420 2.296 Ts ( C.) 861 N.A. N.A. 869 N.A. N.A. N.A. 819 N.A. 745 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,677 1,633 1,593 1,641 1,623 1,623 1,630 1,616 1,541 1,623 E (GPa) 71 81 N.A. 77 N.A. N.A. N.A. 67 84 70 CS.sub.K (MPa) 638 867 854 779 884 733 790 553 1,026 552 DOL.sub.K (m) 15 9 5 11 7 8 8 12 6 10 CS.sub.Na (MPa) N.A. 359 342 N.A. 396 344 389 312 312 241 CS30.sub.Na (MPa) N.A. 165 101 N.A. 132 120 132 121 108 102 DOC.sub.Na (m) N.A. 75 57 N.A. 61 62 61 67 60 70 CTcv.sub.Na (MPa) N.A. 44 27 N.A. 36 31 34 28 34 27 DOC.sub.Na/DOL.sub.K N.A. 8.0 10.9 N.A. 8.6 8.3 7.3 5.6 9.4 7.1 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00004 TABLE 4 No. No. No. No. No. No. No. No. No. No. Component (mol %) 031 032 033 034 035 036 037 038 039 040 SiO.sub.2 69.865 69.863 69.865 69.865 69.865 69.866 69.866 69.865 69.864 73.854 Al.sub.2O.sub.3 9.0 11.0 11.0 9.0 9.0 10.0 9.0 11.0 9.0 10.0 B.sub.2O.sub.3 0.0 10.0 0.0 10.0 0.0 5.0 5.0 5.0 5.0 6.0 Li.sub.2O 8.0 7.0 7.0 9.0 9.0 7.0 8.0 7.0 9.0 7.0 Na.sub.2O 3.0 2.0 2.0 2.0 2.0 3.0 3.0 2.0 2.0 3.0 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 10.0 0.0 10.0 0.0 10.0 5.0 5.0 5.0 5.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.001 0.003 0.001 0.001 0.001 0.000 0.000 0.001 0.002 0.012 B.sub.2O.sub.3 + MgO + CaO 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 6.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 R.sub.2O/Al.sub.2O.sub.3 1.22 0.82 0.82 1.22 1.22 1.00 1.22 0.82 1.22 1.00 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.43 1.22 0.58 0.82 0.43 0.67 0.56 0.79 0.56 1.00 Na.sub.2O/Li.sub.2O 0.38 0.29 0.29 0.22 0.22 0.43 0.38 0.29 0.22 0.43 Li.sub.2O/Al.sub.2O.sub.3 0.89 0.64 0.64 1.00 1.00 0.70 0.89 0.64 1.00 0.70 Q 22.37 9.86 19.87 11.87 21.87 16.37 17.37 14.87 16.86 19.35 X 451 452 481 495 524 415 437 466 510 407 Y 7 14 8 13 6 11 10 11 9 17 Z 32 57 37 62 42 39 42 47 52 50 W 426 392 450 438 497 374 397 421 468 362 U 8,281 8,557 8,759 8,105 8,306 8,407 8,181 8,658 8,206 8,280 (g/cm.sup.3) 2.419 2.283 2.421 2.293 2.415 2.356 2.359 2.351 2.356 2.295 Ts ( C.) N.A. 856 N.A. 742 N.A. 817 773 857 N.A. 869 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,511 1,608 1,546 1,595 1,500 1,563 1,533 1,589 1,530 1,680 E (GPa) 84 68 86 70 85 77 78 77 78 70 CS.sub.K (MPa) 952 565 N.A. 543 964 773 756 759 721 637 DOL.sub.K (m) 6 10 N.A. 9 5 9 8 8 7 16 CS.sub.Na (MPa) 368 312 336 339 387 310 298 330 379 288 CS30.sub.Na (MPa) 115 113 107 117 149 112 97 115 115 151 DOC.sub.Na (m) 58 64 59 62 67 63 59 62 58 84 CTcv.sub.Na (MPa) 33 27 31 29 35 30 29 29 30 42 DOC.sub.Na/DOL.sub.K 9.2 6.4 N.A. 7.0 12.6 7.1 7.6 8.0 8.4 5.2 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. 0.86 0.87 N.A. N.A. N.A. N.A. 0.92 0.75 N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00005 TABLE 5 No. No. No. No. No. No. No. No. No. No. Component (mol %) 041 042 043 044 045 046 047 048 049 050 SiO.sub.2 73.858 73.866 73.858 73.862 73.862 73.855 73.858 65.865 65.864 65.865 Al.sub.2O.sub.3 9.0 11.0 9.0 10.0 9.0 11.0 9.0 12.0 10.8 13.2 B.sub.2O.sub.3 6.0 6.0 6.0 3.0 3.0 3.0 3.0 10.0 10.0 10.0 Li.sub.2O 8.0 7.0 9.0 7.0 8.0 7.0 9.0 8.4 9.6 8.4 Na.sub.2O 3.0 2.0 2.0 3.0 3.0 2.0 2.0 3.6 3.6 2.4 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 3.0 3.0 3.0 3.0 0.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.008 0.000 0.008 0.004 0.004 0.011 0.008 0.001 0.002 0.001 B.sub.2O.sub.3 + MgO + CaO 6.0 6.0 6.0 6.0 6.0 6.0 6.0 10.0 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 20.0 20.0 20.0 20.0 20.0 20.0 20.0 24.0 24.0 24.0 R.sub.2O/Al.sub.2O.sub.3 1.22 0.82 1.22 1.00 1.22 0.82 1.22 1.00 1.22 0.82 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.82 1.22 0.82 0.77 0.64 0.92 0.64 1.00 0.82 1.22 Na.sub.2O/Li.sub.2O 0.38 0.29 0.22 0.43 0.38 0.29 0.22 0.43 0.38 0.29 Li.sub.2O/Al.sub.2O.sub.3 0.89 0.64 1.00 0.70 0.89 0.64 1.00 0.70 0.89 0.64 Q 20.36 17.87 19.86 22.36 23.36 20.86 22.86 2.33 1.14 4.14 X 429 459 502 416 438 468 511 514 540 575 Y 16 16 15 15 14 14 13 14 13 13 Z 53 58 63 44 47 52 57 57 60 66 W 386 410 456 380 403 427 474 421 449 478 U 8,054 8,533 8,079 8,342 8,115 8,592 8,140 8,210 7,938 8,511 (g/cm.sup.3) 2.319 2.288 2.313 2.343 2.348 2.337 2.344 2.307 2.319 2.310 Ts ( C.) 772 927 775 878 N.A. 923 N.A. 811 741 840 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,655 1,682 1,637 1,659 1,623 1,673 1,617 1,569 1,548 1,554 E (GPa) 74 71 74 76 77 77 77 69 72 70 CS.sub.K (MPa) 597 645 573 778 719 794 711 676 639 693 DOL.sub.K (m) 11 14 10 12 12 11 9 12 10 9 CS.sub.Na (MPa) 308 306 366 300 316 255 349 375 362 384 CS30.sub.Na (MPa) 138 151 152 141 138 121 146 171 147 150 DOC.sub.Na (m) 75 80 71 75 72 75 69 75 68 68 CTcv.sub.Na (MPa) 32 39 35 39 35 38 39 42 38 33 DOC.sub.Na/DOL.sub.K 6.8 5.7 7.2 6.1 6.1 6.7 7.7 6.1 6.8 7.3 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00006 TABLE 6 No. No. No. No. No. No. No. No. No. No. Component (mol %) 051 052 053 054 055 056 057 058 059 060 SiO.sub.2 65.865 65.865 65.863 65.864 65.863 69.864 69.863 69.864 69.864 69.864 Al.sub.2O.sub.3 10.8 12.0 10.8 13.2 10.8 10.0 10.0 10.5 10.0 11.0 B.sub.2O.sub.3 10.0 5.0 5.0 5.0 5.0 7.5 7.5 7.5 7.5 7.5 Li.sub.2O 10.8 8.4 9.6 8.4 10.8 8.0 8.5 8.0 7.0 7.0 Na.sub.2O 2.4 3.6 3.6 2.4 2.4 2.0 1.5 1.5 3.0 2.0 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 5.0 5.0 5.0 5.0 2.5 2.5 2.5 2.5 2.5 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.001 0.001 0.003 0.002 0.003 0.002 0.003 0.002 0.002 0.002 B.sub.2O.sub.3 + MgO + CaO 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 24.0 24.0 24.0 24.0 24.0 20.0 20.0 20.0 20.0 20.0 R.sub.2O/Al.sub.2O.sub.3 1.22 1.00 1.22 0.82 1.22 1.00 1.00 0.90 1.00 0.82 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.82 0.71 0.59 0.84 0.59 0.80 0.80 0.88 0.80 0.96 Na.sub.2O/Li.sub.2O 0.22 0.43 0.38 0.29 0.22 0.25 0.18 0.19 0.43 0.29 Li.sub.2O/Al.sub.2O.sub.3 1.00 0.70 0.89 0.64 1.00 0.80 0.85 0.76 0.70 0.64 Q 1.74 2.67 3.86 0.86 3.26 13.36 13.11 12.61 13.86 12.36 X 627 528 554 590 642 481 517 506 408 459 Y 11 10 9 10 8 12 11 12 13 13 Z 72 47 50 56 62 54 60 58 44 52 W 534 450 478 507 563 430 465 454 359 407 U 7,968 8,310 8,039 8,612 8,069 8,381 8,394 8,507 8,357 8,608 (g/cm.sup.3) 2.315 2.380 2.384 2.377 2.380 2.317 2.316 2.314 2.321 2.316 Ts ( C.) 744 802 N.A. 843 746 811 810 837 812 856 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,533 1,508 1,481 1,515 1,473 1,587 1,584 1,591 1,600 1,599 E (GPa) 72 79 79 79 80 73 73 72 72 72 CS.sub.K (MPa) 627 964 867 952 850 692 674 689 665 673 DOL.sub.K (m) 9 8 7 7 6 9 8 9 10 10 CS.sub.Na (MPa) 420 419 405 449 501 375 402 390 309 323 CS30.sub.Na (MPa) 133 153 137 136 143 124 124 128 115 122 DOC.sub.Na (m) 59 64 61 58 56 61 59 61 65 66 CTcv.sub.Na (MPa) 37 37 36 36 40 31 30 32 28 29 DOC.sub.Na/DOL.sub.K 6.6 8.1 8.7 8.7 9.0 6.7 7.0 6.9 6.5 6.9 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. 0.85 N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00007 TABLE 7 No. No. No. No. No. No. No. No. No. No. Component (mol %) 061 062 063 064 065 066 067 068 069 070 SiO.sub.2 71.864 71.864 71.863 71.864 71.864 69.864 69.864 67.864 67.966 67.865 Al.sub.2O.sub.3 10.0 10.0 10.5 10.0 11.0 10.0 10.5 11.0 11.0 11.0 B.sub.2O.sub.3 8.0 8.0 8.0 8.0 8.0 10.0 10.0 7.5 7.5 7.5 Li.sub.2O 8.0 8.5 8.0 7.0 7.0 8.5 8.0 8.8 9.3 7.7 Na.sub.2O 2.0 1.5 1.5 3.0 2.0 1.5 1.5 2.2 1.6 3.3 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.5 2.5 2.5 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.002 0.002 0.003 0.002 0.002 0.002 0.002 0.002 0.000 0.001 B.sub.2O.sub.3 + MgO + CaO 8.0 8.0 8.0 8.0 8.0 10.0 10.0 10.0 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 20.0 20.0 20.0 20.0 20.0 20.0 20.0 22.0 21.9 22.0 R.sub.2O/Al.sub.2O.sub.3 1.00 1.00 0.90 1.00 0.82 1.00 0.90 1.00 0.99 1.00 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.00 1.00 1.11 1.00 1.22 1.00 1.11 0.81 0.82 0.81 Na.sub.2O/Li.sub.2O 0.25 0.18 0.19 0.43 0.29 0.18 0.19 0.25 0.17 0.43 Li.sub.2O/Al.sub.2O.sub.3 0.80 0.85 0.76 0.70 0.64 0.85 0.76 0.80 0.85 0.70 Q 14.86 14.61 14.11 15.36 13.86 10.61 10.11 6.46 6.47 7.02 X 477 513 502 404 455 510 499 545 583 464 Y 14 14 14 15 15 13 13 11 11 12 Z 60 65 64 50 57 65 63 59 65 48 W 424 460 448 353 401 451 439 475 513 397 U 8,319 8,331 8,444 8,294 8,545 8,344 8,457 8,336 8,364 8,308 (g/cm.sup.3) 2.286 2.284 2.285 2.289 2.290 2.275 2.277 2.329 2.328 2.333 Ts ( C.) 844 850 875 851 890 823 846 806 806 806 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,651 1,658 1,658 1,660 1,656 1,618 1,612 1,558 1,554 1,567 E (GPa) 69 69 68 68 69 67 67 73 74 73 CS.sub.K (MPa) 589 590 599 592 602 544 570 748 738 753 DOL.sub.K (m) 13 13 13 15 12 11 11 9 8 10 CS.sub.Na (MPa) 371 404 385 310 328 372 363 409 465 344 CS30.sub.Na (MPa) 162 168 152 143 135 135 134 132 142 128 DOC.sub.Na (m) 73 70 68 76 69 64 65 60 58 65 CTcv.sub.Na (MPa) 39 40 37 36 32 35 32 35 37 32 DOC.sub.Na/DOL.sub.K 5.5 5.5 5.4 5.2 5.7 5.6 5.9 6.9 7.1 6.6 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00008 TABLE 8 No. No. No. No. No. No. No. No. No. No. Component (mol %) 071 072 073 074 075 076 077 078 079 080 SiO.sub.2 67.865 69.865 69.963 69.863 69.864 65.863 66.965 67.965 67.965 73.865 Al.sub.2O.sub.3 12.1 11.0 11.0 11.0 12.1 10.8 12.6 11.0 11.5 9.0 B.sub.2O.sub.3 7.5 6.0 6.0 6.0 6.0 5.0 7.5 7.5 7.5 3.0 Li.sub.2O 7.7 8.8 9.3 7.7 7.7 8.4 8.0 8.2 8.2 7.0 Na.sub.2O 2.2 2.2 1.6 3.3 2.2 4.8 2.3 2.7 2.2 4.0 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 2.5 2.0 2.0 2.0 2.0 5.0 2.5 2.5 2.5 3.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.001 0.001 0.003 0.003 0.002 0.003 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 10.0 8.0 8.0 8.0 8.0 10.0 10.0 10.0 10.0 6.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 22.0 22.0 21.9 22.0 22.0 24.0 22.9 21.9 21.9 20.0 R.sub.2O/Al.sub.2O.sub.3 0.82 1.00 0.99 1.00 0.82 1.22 0.82 0.99 0.90 1.22 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.98 0.85 0.85 0.85 1.02 0.59 0.98 0.82 0.89 0.64 Na.sub.2O/Li.sub.2O 0.29 0.25 0.17 0.43 0.29 0.57 0.29 0.33 0.27 0.57 Li.sub.2O/Al.sub.2O.sub.3 0.64 0.80 0.85 0.70 0.64 0.78 0.63 0.75 0.71 0.78 Q 5.37 9.97 9.96 10.51 8.86 4.46 2.22 7.02 6.27 23.87 X 521 547 585 466 523 467 548 503 529 365 Y 12 13 12 14 14 11 12 12 12 15 Z 57 61 67 49 58 37 59 54 58 36 W 450 481 520 403 456 393 468 436 459 333 U 8,585 8,313 8,341 8,286 8,562 8,009 8,575 8,337 8,462 8,091 (g/cm.sup.3) 2.329 2.329 2.328 2.333 2.330 2.386 2.334 2.330 2.328 2.351 Ts ( C.) 850 827 828 827 877 759 839 808 829.5 818 .sub.300-380 C. 48.1 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,576 1,588 1,588 1,605 1,608 1,472 1,538 1,549 1,553 1,633 E (GPa) 73 74 75 74 74 79 74 74 73 78 CS.sub.K (MPa) 761 770 756 768 781 871 790 747 743 726 DOL.sub.K (m) 9 10 9 11 10 8 8 10 9 12 CS.sub.Na (MPa) 376 432 442 346 374 322 376 342 385 261 CS30.sub.Na (MPa) 124 168 168 147 141 135 141 150 141 129 DOC.sub.Na (m) 60 67 66 71 65 70 65 73 64 80 CTcv.sub.Na (MPa) 32 41 40 37 37 36 36 37 37 35 DOC.sub.Na/DOL.sub.K 6.9 6.8 7.1 6.3 6.5 8.7 7.7 7.5 7.0 6.9 Acid resistance 0.03 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance 1.32 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) 0.83 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00009 TABLE 9 No. No. No. No. No. No. No. No. No. No. Component (mol %) 081 082 083 084 085 086 087 088 089 090 SiO.sub.2 69.864 69.858 69.866 69.861 69.858 69.860 69.862 69.859 69.854 69.859 Al.sub.2O.sub.3 10.8 10.8 10.8 10.8 10.8 10.8 10.8 11.8 12.8 12.8 B.sub.2O.sub.3 3.0 2.0 1.0 0.0 1.0 1.0 0.0 1.0 1.0 0.0 Li.sub.2O 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 8.4 Na.sub.2O 4.8 5.8 6.8 7.8 5.8 4.8 5.8 5.8 4.8 5.8 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 3.0 3.0 3.0 3.0 4.0 5.0 5.0 3.0 3.0 3.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.002 0.008 0.000 0.005 0.008 0.006 0.004 0.007 0.012 0.007 B.sub.2O.sub.3 + MgO + CaO 6.0 5.0 4.0 3.0 5.0 6.0 5.0 4.0 4.0 3.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 24.0 25.0 26.0 27.0 25.0 24.0 25.0 26.0 26.0 27.0 R.sub.2O/Al.sub.2O.sub.3 1.22 1.31 1.41 1.50 1.31 1.22 1.31 1.20 1.03 1.11 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.67 0.63 0.59 0.56 0.59 0.59 0.56 0.69 0.79 0.74 Na.sub.2O/Li.sub.2O 0.57 0.69 0.81 0.93 0.69 0.57 0.69 0.69 0.57 0.69 Li.sub.2O/Al.sub.2O.sub.3 0.78 0.78 0.78 0.78 0.78 0.78 0.78 0.71 0.66 0.66 Q 10.46 9.96 9.47 8.96 10.96 12.46 11.96 7.96 6.45 5.96 X 468 447 426 405 450 474 453 477 528 507 Y 14 15 16 16 14 13 14 15 15 16 Z 42 37 32 26 35 38 33 39 47 42 W 400 375 350 325 380 411 386 397 445 420 U 7,944 7,778 7,614 7,449 7,798 7,984 7,819 7,865 8,116 7,951 (g/cm.sup.3) 2.376 2.389 2.400 2.410 2.398 2.397 2.408 2.392 2.388 2.400 Ts ( C.) 795 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,564 1,549 1,544 1,536 1,546 1,547 1,546 1,579 1,596 1,602 E (GPa) 77 79 80 80 80 81 81 79 80 80 CS.sub.K (MPa) 824 817 808 803 876 944 955 922 1,050 1,093 DOL.sub.K (m) 11 11 12 13 11 10 11 13 14 14 CS.sub.Na (MPa) 302 282 258 253 323 310 293 282 334 291 CS30.sub.Na (MPa) 152 149 148 150 157 163 162 163 189 188 DOC.sub.Na (m) 80 83 91 96 79 83 87 92 90 110 CTcv.sub.Na (MPa) 43 46 48 47 46 49 52 53 58 71 DOC.sub.Na/DOL.sub.K 7.5 7.4 7.6 7.1 7.0 8.1 7.6 7.1 6.7 8.0 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00010 TABLE 10 No. No. No. No. No. No. No. No. No. No. Component (mol %) 091 092 093 094 095 096 097 098 099 100 SiO.sub.2 70.858 71.866 71.866 65.864 66.365 66.064 67.644 69.365 66.56 66.564 Al.sub.2O.sub.3 10.8 10.8 10.8 12.1 12.1 12.1 12.1 11.9 12.1 12.1 B.sub.2O.sub.3 1.0 1.0 0.0 7.5 7.0 7.5 7.5 4.3 7.5 7.5 Li.sub.2O 8.4 8.4 8.4 8.2 8.2 7.7 7.7 7.7 7.7 7.7 Na.sub.2O 5.8 4.8 5.8 3.4 3.4 3.7 2.2 3.8 2.9 3.2 K.sub.2O 0.0 0.0 0.0 0.3 0.3 0.3 0 0.3 0.6 0.3 MgO 3.0 3.0 3.0 2.5 2.5 2.5 2.5 2.5 2.5 2.5 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.03 0.03 0.03 0.25 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Cl 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 0.10 MoO.sub.3 0.008 0.000 0.000 0.002 0.001 0.002 0.002 0.001 0.002 0.002 B.sub.2O.sub.3 + MgO + CaO 4.0 4.0 3.0 10.0 9.5 10.0 10.0 6.8 10.0 10.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 25.0 24.0 25.0 24.0 24.0 23.8 22.0 23.7 23.3 23.3 R.sub.2O/Al.sub.2O.sub.3 1.31 1.22 1.31 0.98 0.98 0.97 0.82 0.99 0.93 0.93 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.63 0.67 0.63 0.84 0.84 0.85 0.98 0.83 0.88 0.88 Na.sub.2O/Li.sub.2O 0.69 0.57 0.69 0.41 0.41 0.48 0.29 0.49 0.38 0.42 Li.sub.2O/Al.sub.2O.sub.3 0.78 0.78 0.78 0.68 0.68 0.64 0.64 0.65 0.64 0.64 Q 11.96 14.47 13.97 0.26 1.27 1.01 5.14 7.97 2.41 2.26 X 449 471 450 519 520 487 521 485 506 498 Y 15 15 16 12 12 12 12 14 12 12 Z 37 43 37 52 52 48 57 48 53 51 W 379 409 384 435 437 406 450 413 429 420 U 7,772 7,931 7,767 8,284 8,281 8,303 8,565 8,249 8,386 8,382 (g/cm.sup.3) 2.390 2.380 2.391 2.345 2.347 2.343 2.338 2.357 2.338 2.337 Ts ( C.) N.A. N.A. N.A. 795 799 801 850 896 806 805 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,575 1,600 1,597 1,526 1,538 1,529 1,559 1,604 1,532 1,531 E (GPa) 79 79 N.A. N.A. N.A. 73 N.A. N.A. 73 74 CS.sub.K (MPa) 853 881 878 794 801 783 766 882 744 756 DOL.sub.K (m) 12 12 13 10 10 11 9 13 10 10 CS.sub.Na (MPa) 244 289 254 380 366 340 355 321 339 354 CS30.sub.Na (MPa) 152 163 155 139 123 122 128 162 110 130 DOC.sub.Na (m) 103 88 97 65 61 63 64 82 60 65 CTcv.sub.Na (MPa) 51 57 57 33 34 32 32 41 30 32 DOC.sub.Na/DOL.sub.K 8.8 7.5 7.5 6.4 5.9 5.9 7.3 6.5 5.7 6.6 Acid resistance N.A. N.A. N.A. N.A. N.A. 0.17 N.A. 0.03 0.20 0.27 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 1.32 N.A. 0.88 N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00011 TABLE 11 Component (mol %) No. 101 No. 102 No. 103 SiO.sub.2 66.565 66.564 68.146 Al.sub.2O.sub.3 12.1 12.1 9.5 B.sub.2O.sub.3 7.5 7.2 0.1 Li.sub.2O 7.7 7.7 9.0 Na.sub.2O 2.9 2.9 8.2 K.sub.2O 0.9 0.9 3.0 MgO 2.2 2.5 2.0 CaO 0.0 0.0 0.0 SrO 0.0 0.0 0.0 BaO 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 SO.sub.3 0.000 0.000 0.000 Cl 0.10 0.10 0.01 MoO.sub.3 0.001 0.002 0.000 B.sub.2O.sub.3 + MgO + CaO 9.7 9.7 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 23.6 23.6 29.7 R.sub.2O/Al.sub.2O.sub.3 0.95 0.95 2.13 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.88 0.86 0.43 Na.sub.2O/Li.sub.2O 0.38 0.38 0.91 Li.sub.2O/Al.sub.2O.sub.3 0.64 0.64 0.95 Q 2.12 2.41 6.25 X 506 507 392 Y 12 12 16 Z 53 53 26 W 429 430 312 U 8,334 8,340 6,729 (g/cm.sup.3) 2.337 2.342 2.428 Ts ( C.) 799 800 701 .sub.300-380 C. N.A. N.A. 94.3 (10.sup.7/ C.) 10.sup.2.5 dPa's ( C.) 1,538 1,532 1,427 E (GPa) N.A. N.A. 78 CS.sub.K (MPa) 722 736 506 DOL.sub.K (m) 11 11 17 CS.sub.Na (MPa) 333 331 136 CS30.sub.Na (MPa) 102 118 N.A. DOC.sub.Na (m) 58 64 79 CTcv.sub.Na (MPa) 27 28 N.A. DOC.sub.Na/DOL.sub.K 5.2 5.6 4.6 Acid resistance 0.18 0.22 0.00 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. 0.56 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A.

TABLE-US-00012 TABLE 12 No. No. No. No. No. No. No. No. No. No. Component (mol %) 104 105 106 107 108 109 110 111 112 113 SiO.sub.2 67.145 66.845 66.845 67.125 67.095 67.075 66.885 67.275 67.365 66.825 Al.sub.2O.sub.3 16.0 15.8 15.6 16.0 16.0 16.0 14.4 15.2 16.0 15.6 B.sub.2O.sub.3 1.2 1.5 1.7 1.2 1.2 1.2 3.6 2.3 1.1 1.7 Li.sub.2O 7.5 7.5 7.5 7.5 7.5 7.5 3.8 5.7 7.4 7.5 Na.sub.2O 7.4 7.5 7.5 7.4 7.4 7.4 3.7 5.5 7.2 7.5 K.sub.2O 0.3 0.3 0.3 0.3 0.3 0.3 0.2 0.2 0.3 0.3 MgO 0.3 0.4 0.4 0.3 0.3 0.3 2.2 1.2 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 0.0 3.7 1.8 0.1 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.1 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 1.2 0.6 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.07 0.10 0.12 0.06 0.04 0.03 0.07 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 1.5 1.9 2.1 1.5 1.5 1.5 9.5 5.3 1.6 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.2 31.1 30.9 31.2 31.2 31.2 22.1 26.6 30.9 30.9 R.sub.2O/Al.sub.2O.sub.3 0.95 0.97 0.98 0.95 0.95 0.95 0.53 0.75 0.93 0.98 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.03 1.01 0.99 1.03 1.03 1.03 0.96 1.01 1.04 0.99 Na.sub.2O/Li.sub.2O 0.99 1.00 1.00 0.99 0.99 0.99 0.97 0.96 0.97 1.00 Li.sub.2O/Al.sub.2O.sub.3 0.47 0.47 0.48 0.47 0.47 0.47 0.26 0.38 0.46 0.48 Q 8.45 8.60 8.20 8.47 8.50 8.53 6.73 0.47 7.63 8.22 X 512 504 498 512 512 512 381 450 512 498 Y 20 19 19 20 20 20 11 16 19 19 Z 42 40 40 42 42 41 27 35 42 40 W 384 377 372 384 384 384 264 329 386 372 U 8,006 7,976 7,959 8,004 8,002 8,000 9,156 8,587 8,057 7,957 (g/cm.sup.3) 2.397 2.397 2.395 2.398 2.400 2.400 2.462 2.430 2.398 2.395 Ts ( C.) 935 922 915 937 935 935 906 913 938 912 .sub.300-380 C. N.A. N.A. 77 N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,627 1,615 1,611 1,626 1,624 1,626 1,569 1,600 1,628 1,614 E (GPa) 78 78 78 79 78 78 80 78 78 77 CS.sub.K (MPa) 1,237 1,212 1,195 1,251 1,249 1,256 791 1,252 1,279 1,184 DOL.sub.K (m) 25 24 24 25 25 25 N.A. 11 24 24 CS.sub.Na (MPa) 299 322 333 317 328 324 199 319 338 306 CS30.sub.Na (MPa) 196 202 206 203 210 205 56 133 205 190 DOC.sub.Na (m) 111 103 102 106 107 104 56 70 99 101 CTcv.sub.Na (MPa) 70 68 65 68 69 67 15 35 65 65 DOC.sub.Na/DOL.sub.K 4.5 4.2 4.2 4.3 4.3 4.2 N.A. 6.1 4.2 4.3 Acid resistance 0.16 0.24 0.22 0.20 N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance 0.50 0.52 0.50 0.49 N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) 0.81 N.A. 0.80 N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy 8.39 N.A. 8.23 N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00013 TABLE 13 Component (mol %) No. 114 No. 115 No. 116 No. 117 No. 118 No. 119 No. 120 No. 121 No. 122 No. 123 SiO.sub.2 66.795 59.065 61.065 63.165 62.665 65.765 74.465 63.165 70.165 67.665 Al.sub.2O.sub.3 15.6 17.2 14.4 13.2 13.2 16.0 9.9 17.8 10.8 11.4 B.sub.2O.sub.3 1.7 2.2 10.0 10.0 10.0 3.0 6.5 0.2 9.3 5.8 Li.sub.2O 7.5 12.3 10.1 8.2 8.4 7.5 6.6 8.7 8.0 11.9 Na.sub.2O 7.5 6.3 4.3 4.8 5.1 7.3 2.1 8.7 1.4 1.3 K.sub.2O 0.3 0.0 0.0 0.3 0.3 0.3 0.3 1.3 0.2 1.4 MgO 0.4 1.3 0.0 0.2 0.2 0.0 0.0 0.0 0.0 0.4 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.10 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 0.03 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 1.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 3.5 10.0 10.2 10.2 3.0 6.5 0.2 9.3 6.2 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 30.9 35.8 28.8 26.5 27.0 31.1 18.9 36.5 20.4 26.0 R.sub.2O/Al.sub.2O.sub.3 0.98 1.08 1.00 1.01 1.05 0.94 0.91 1.05 0.89 1.28 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.99 0.86 1.00 0.98 0.94 1.06 1.10 0.95 1.13 0.76 Na.sub.2O/Li.sub.2O 1.00 0.51 0.43 0.59 0.61 0.97 0.32 1.00 0.18 0.11 Li.sub.2O/Al.sub.2O.sub.3 0.48 0.72 0.70 0.62 0.64 0.47 0.67 0.49 0.74 1.04 Q 8.25 26.87 18.79 10.34 11.69 11.49 21.62 22.19 10.17 0.51 X 498 813 651 511 514 511 405 596 511 734 Y 19 14 13 14 14 19 16 20 14 12 Z 40 71 66 51 50 42 53 45 65 85 W 372 634 514 399 399 379 368 432 450 642 U 7,954 7,533 8,094 8,119 8,045 8,027 8,427 7,648 8,467 7,831 (g/cm.sup.3) 2.396 2.413 2.330 2.326 2.331 2.385 2.288 2.428 2.283 2.347 Ts ( C.) 914 N.A. 760 791 796 904 910 N.A. 861 N.A. .sub.300-380 C. N.A. 78.1 65.1 N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,616 1,461 1,456 1,509 1,523 1,593 1,712 1,574 1,615 1,545 E (GPa) 78 79.4 71 69 70 76 69 80 68 76 CS.sub.K (MPa) 1,186 855 700 706 770 1,152 591 1,204 574 648 DOL.sub.K (m) 24 11 10 13 14 23 17 26 11 10 CS.sub.Na (MPa) 302 556 509 381 389 351 271 365 377 459 CS30.sub.Na (MPa) 190 275 166 149 147 201 122 210 120 131 DOC.sub.Na (m) 103 79 60 67 66 92 74 92 60 57 CTcv.sub.Na (MPa) 65 80 42 37 35 60 31 66 30 34 DOC.sub.Na/DOL.sub.K 4.4 7.5 6.0 5.2 4.8 4.0 4.3 3.5 5.4 5.7 Acid resistance N.A. N.A. 39.80 N.A. 3.98 1.58 N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. 1.10 N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. 0.81 N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. 9.24 N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00014 TABLE 14 Component (mol %) No. 124 No. 125 No. 126 No. 127 No. 128 No. 129 No. 130 No. 131 No. 132 No. 133 SiO.sub.2 64.265 67.465 67.465 62.955 62.955 63.055 63.055 63.055 63.055 61.055 Al.sub.2O.sub.3 13.1 16.0 15.0 13.8 17.8 13.8 15.8 13.8 13.8 15.8 B.sub.2O.sub.3 7.7 1.0 2.0 0.1 0.1 0.0 0.0 0.0 2.0 2.0 Li.sub.2O 8.2 7.5 7.5 8.3 4.3 5.3 4.3 4.3 6.3 6.3 Na.sub.2O 6.1 7.3 7.3 11.1 11.1 11.1 11.1 11.1 11.1 11.1 K.sub.2O 0.3 0.3 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.2 0.3 0.3 0.0 0.0 2.0 2.0 4.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.03 0.03 0.03 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 2.5 2.5 2.5 2.5 2.5 2.5 2.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 7.9 1.3 2.3 0.1 0.1 2.0 2.0 4.0 2.0 2.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 27.7 31.1 30.1 33.2 33.2 31.2 31.2 29.2 31.2 33.2 R.sub.2O/Al.sub.2O.sub.3 1.11 0.94 1.01 1.41 0.87 1.26 0.97 1.12 1.26 1.10 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.89 1.04 0.97 0.71 1.16 0.71 0.91 0.71 0.79 0.91 Na.sub.2O/Li.sub.2O 0.74 0.97 0.97 1.34 2.58 1.76 2.58 2.58 1.76 1.76 Li.sub.2O/Al.sub.2O.sub.3 0.63 0.47 0.50 0.60 0.24 0.46 0.27 0.31 0.46 0.40 Q 8.58 7.78 5.78 8.79 12.80 4.60 6.60 0.59 6.60 14.60 X 483 515 484 411 325 314 271 216 308 365 Y 15 20 19 20 23 19 21 18 21 21 Z 44 42 40 20 10 6 1 8 10 14 W 370 388 366 273 180 194 147 114 182 218 U 7,889 8,022 7,936 6,724 7,629 7,043 7,496 7,363 7,003 7,188 (g/cm.sup.3) 2.350 2.397 2.389 2.436 2.432 2.443 2.442 2.452 2.420 2.427 Ts ( C.) 795 942 896 881 949 886 901 906 N.A. 841 .sub.300-380 C. N.A. N.A. N.A. 87.4 76.2 85.1 79 83.1 81.7 81.6 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,556 1,637 1,615 1,512 1,629 1,539 1,603 1,559 1,547 1,549 E (GPa) 72 79 77 76 75 77 76 76 73 74 CS.sub.K (MPa) 806 1,239 1,104 N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOL.sub.K (m) 15 24 22 N.A. N.A. N.A. N.A. N.A. N.A. N.A. CS.sub.Na (MPa) 363 312 305 N.A. N.A. N.A. N.A. N.A. N.A. N.A. CS30.sub.Na (MPa) 173 203 191 N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) 78 109 103 N.A. N.A. N.A. N.A. N.A. N.A. N.A. CTcv.sub.Na (MPa) 44 71 64 N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 5.1 4.5 4.6 N.A. N.A. N.A. N.A. N.A. N.A. N.A. Acid resistance 0.77 0.16 0.16 N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance 1.19 0.71 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. 0.80 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. 8.14 N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00015 TABLE 15 Component (mol %) No. 134 No. 135 No. 136 No. 137 No. 138 No. 139 No. 140 No. 141 No. 142 No. 143 SiO.sub.2 61.055 62.955 60.955 60.955 62.955 64.955 60.955 64.955 62.955 62.955 Al.sub.2O.sub.3 13.8 13.8 15.8 13.8 17.8 15.8 19.8 17.8 19.8 15.8 B.sub.2O.sub.3 4.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Li.sub.2O 6.3 6.3 6.3 6.3 6.3 6.3 6.3 4.3 4.3 6.3 Na.sub.2O 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 11.1 13.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 2.5 4.5 4.5 6.5 0.5 0.5 0.5 0.5 0.5 0.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 4.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.2 31.2 33.2 31.2 35.2 33.2 37.2 33.2 35.2 35.2 R.sub.2O/Al.sub.2O.sub.3 1.26 1.26 1.10 1.26 0.98 1.10 0.88 0.87 0.78 1.23 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.79 0.79 0.91 0.79 1.02 0.91 1.14 1.16 1.29 0.81 Na.sub.2O/Li.sub.2O 1.76 1.76 1.76 1.76 1.76 1.76 1.76 2.58 2.58 2.08 Li.sub.2O/Al.sub.2O.sub.3 0.46 0.46 0.40 0.46 0.35 0.40 0.32 0.24 0.22 0.40 Q 10.60 2.40 10.40 2.00 19.20 11.20 27.20 13.20 21.20 16.20 X 305 314 371 317 422 365 479 322 379 320 Y 19 21 21 21 22 22 22 24 24 23 Z 9 10 15 10 20 15 24 10 15 4 W 173 190 227 190 263 227 299 180 217 168 U 7,016 6,736 6,922 6,482 7,617 7,431 7,802 7,884 8,070 7,114 (g/cm.sup.3) 2.413 2.415 2.425 2.404 2.450 2.445 2.461 2.443 2.458 2.460 Ts ( C.) 825 N.A. 866 846 N.A. N.A. 927 968 961 823 .sub.300-380 C. 81.2 82.8 82.7 82.4 81 83.6 79.1 75.3 71 89.2 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,518 1,580 1,576 1,572 1,585 1,598 1,558 1,635 1,607 1,553 E (GPa) 72 73 73 70 78 79 81 79 80 78 CS.sub.K (MPa) N.A. N.A. N.A. N.A. N.A. 1,125 1,455 1,343 1,348 945 DOL.sub.K (m) N.A. N.A. N.A. N.A. N.A. 20 18 21 17 20 CS.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. 249 289 209 176 216 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) N.A. N.A. N.A. N.A. N.A. 115 126 132 107 111 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K N.A. N.A. N.A. N.A. N.A. 5.6 7.2 6.3 6.2 5.6 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00016 TABLE 16 Component (mol %) No. 144 No. 145 No. 146 No. 147 No. 148 No. 149 No. 150 No. 151 No. 152 No. 153 SiO.sub.2 60.955 64.955 62.955 61.055 63.055 59.055 61.055 59.055 63.055 61.055 Al.sub.2O.sub.3 17.8 17.8 19.8 17.8 15.8 19.8 15.8 17.8 17.8 19.8 B.sub.2O.sub.3 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Li.sub.2O 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 Na.sub.2O 13.1 9.1 9.1 11.1 11.1 11.1 13.1 13.1 9.1 9.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 0.1 0.1 0.1 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 37.2 33.2 35.2 35.2 33.2 37.2 35.2 37.2 33.2 35.2 R.sub.2O/Al.sub.2O.sub.3 1.09 0.87 0.78 0.98 1.10 0.88 1.23 1.09 0.87 0.78 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.92 1.16 1.29 0.92 0.81 1.02 0.74 0.83 1.02 1.14 Na.sub.2O/Li.sub.2O 2.08 1.44 1.44 1.76 1.76 1.76 2.08 2.08 1.44 1.44 Li.sub.2O/Al.sub.2O.sub.3 0.35 0.35 0.32 0.35 0.40 0.32 0.40 0.35 0.35 0.32 Q 24.20 14.20 22.20 21.00 13.00 29.00 18.00 26.00 16.00 24.00 X 377 468 525 425 368 482 322 379 470 527 Y 23 22 22 20 20 20 20 20 19 19 Z 8 31 35 15 11 20 1 4 26 31 W 204 322 358 266 230 303 171 208 325 361 U 7,300 7,934 8,119 7,669 7,484 7,854 7,167 7,352 7,986 8,171 (g/cm.sup.3) 2.464 2.440 2.455 2.469 2.460 2.478 2.473 2.480 2.457 2.470 Ts ( C.) 872 947 942 N.A. N.A. N.A. 811 N.A. N.A. 911 .sub.300-380 C. 89.6 72.2 69.3 81.5 83.4 79 90.3 88.6 72.6 69.1 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,553 1,607 1,574 1,533 1,544 1,516 1,503 1,499 1,557 1,528 E (GPa) 79 80 82 81 80 82 80 81 82 83 CS.sub.K (MPa) 1,154 1,323 1,330 1,313 1,148 1,371 1,050 1,222 1,301 1,312 DOL.sub.K (m) 21 17 13 14 16 12 16 16 12 10 CS.sub.Na (MPa) N.A. N.A. 257 264 N.A. N.A. 238 N.A. N.A. 284 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) N.A. N.A. 130 103 N.A. N.A. 101 N.A. N.A. 100 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K N.A. N.A. 9.9 7.3 N.A. N.A. 6.4 N.A. N.A. 10.2 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00017 TABLE 17 Component (mol %) No. 154 No. 155 No. 156 No. 157 No. 158 No. 159 No. 160 No. 161 No. 162 No. 163 SiO.sub.2 61.055 61.055 59.055 63.055 61.055 59.055 59.055 57.055 61.055 59.055 Al.sub.2O.sub.3 17.8 15.8 17.8 17.8 19.8 17.8 15.8 17.8 17.8 19.8 B.sub.2O.sub.3 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Li.sub.2O 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 Na.sub.2O 11.1 13.1 13.1 9.1 9.1 11.1 13.1 13.1 9.1 9.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 0.0 0.0 2.0 2.0 2.0 2.0 2.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.0 2.0 2.0 2.0 2.0 4.0 4.0 4.0 4.0 4.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 35.2 35.2 37.2 33.2 35.2 35.2 35.2 37.2 33.2 35.2 R.sub.2O/Al.sub.2O.sub.3 0.98 1.23 1.09 0.87 0.78 0.98 1.23 1.09 0.87 0.78 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.02 0.81 0.92 1.16 1.29 0.92 0.74 0.83 1.02 1.14 Na.sub.2O/Li.sub.2O 1.76 2.08 2.08 1.44 1.44 1.76 2.08 2.08 1.44 1.44 Li.sub.2O/Al.sub.2O.sub.3 0.35 0.40 0.35 0.35 0.32 0.35 0.40 0.35 0.35 0.32 Q 23.00 20.00 28.00 18.00 26.00 25.00 22.00 30.00 20.00 28.00 X 419 316 373 465 521 421 319 376 467 524 Y 21 22 22 21 21 19 19 19 18 18 Z 19 3 8 30 35 15 1 3 26 30 W 255 160 196 313 350 257 162 199 316 352 U 7,629 7,126 7,312 7,946 8,131 7,682 7,179 7,365 7,998 8,184 (g/cm.sup.3) 2.440 2.452 2.454 2.429 2.445 2.459 2.465 2.471 2.446 2.460 Ts ( C.) 872 788 838 897 897 844 777 809 865 873 .sub.300-380 C. 79.4 87.7 87.5 70.5 68.4 80 89 87.7 71.5 69.4 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,541 1,513 1,520 1,564 1,530 1,494 1,464 1,462 1,514 1,483 E (GPa) 77 77 78 78 80 80 78 79 80 81 CS.sub.K (MPa) 1,236 1,136 932 1,244 1,246 1,263 998 1,171 1,223 1,265 DOL.sub.K (m) 17 19 17 14 11 13 15 15 11 8 CS.sub.Na (MPa) 260 225 N.A. N.A. 259 N.A. N.A. N.A. N.A. N.A. CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) 99 105 N.A. N.A. 139 N.A. N.A. N.A. N.A. N.A. CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 6.0 5.6 N.A. N.A. 13.1 N.A. N.A. N.A. N.A. N.A. Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00018 TABLE 18 Component (mol %) No. 164 No. 165 No. 166 No. 167 No. 168 No. 169 No. 170 No. 171 No. 172 No. 173 SiO.sub.2 62.955 62.955 62.955 61.055 61.055 61.055 61.055 60.955 60.955 60.955 Al.sub.2O.sub.3 17.8 13.8 19.8 17.8 13.8 19.8 19.8 17.8 15.8 13.8 B.sub.2O.sub.3 0.1 0.1 0.1 2.0 2.0 2.0 2.0 0.1 0.1 0.1 Li.sub.2O 4.3 8.3 8.3 4.3 8.3 4.3 8.3 4.3 6.3 8.3 Na.sub.2O 13.1 13.1 7.1 13.1 13.1 11.1 7.1 13.1 13.1 13.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 2.5 2.5 2.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 0.1 0.1 0.1 2.0 2.0 2.0 2.0 0.1 0.1 0.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 R.sub.2O/Al.sub.2O.sub.3 0.98 1.55 0.78 0.98 1.55 0.78 0.78 0.98 1.23 1.55 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.02 0.64 1.29 1.02 0.64 1.29 1.29 1.02 0.81 0.64 Na.sub.2O/Li.sub.2O 3.05 1.58 0.86 3.05 1.58 2.58 0.86 3.05 2.08 1.58 Li.sub.2O/Al.sub.2O.sub.3 0.24 0.60 0.42 0.24 0.60 0.22 0.42 0.24 0.40 0.60 Q 18.20 14.20 23.20 22.00 18.00 25.00 27.00 17.80 15.80 13.80 X 276 363 671 273 359 376 667 279 323 366 Y 24 21 20 23 20 23 19 24 22 21 Z 1 9 56 2 8 14 56 1 4 9 W 122 215 500 113 206 208 491 122 168 215 U 7,567 6,662 8,169 7,579 6,674 8,081 8,181 7,312 6,860 6,407 (g/cm.sup.3) 2.454 2.463 2.450 2.442 2.460 2.447 2.440 2.446 2.450 2.451 Ts ( C.) 942 738 930 891 718 914 887 926 842 862 .sub.300-380 C. 83.5 94 66 82.8 91.4 70.3 65.8 84.6 90.5 93.3 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,620 1,461 1,552 1,564 1,441 1,559 1,510 1,603 1,550 1,468 E (GPa) 79 78 83 75 79 78 81 75 76 77 CS.sub.K (MPa) 1,600 711 1,521 1,474 702 1,488 1,441 1,399 1,200 1,080 DOL.sub.K (m) 24 16 10 21 13 14 9 27 26 25 CS.sub.Na (MPa) 192 213 315 163 205 208 315 171 167 161 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) 123 99 111 132 96 96 101 138 136 107 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 5.0 6.2 11.2 6.3 7.4 7.1 11.7 5.1 5.2 4.3 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00019 TABLE 19 Component (mol %) No. 174 No. 175 No. 176 No. 177 No. 178 No. 179 No. 180 No. 181 No. 182 No. 183 SiO.sub.2 60.955 60.955 60.955 61.055 61.055 61.055 61.055 64.155 60.955 60.955 Al.sub.2O.sub.3 19.8 19.8 19.8 17.8 13.8 19.8 19.8 17.8 17.8 17.8 B.sub.2O.sub.3 0.1 0.1 0.1 0.0 0.0 0.0 0.0 0.1 0.1 0.1 Li.sub.2O 4.3 6.3 8.3 4.3 8.3 4.3 8.3 6.3 6.3 6.3 Na.sub.2O 11.1 9.1 7.1 13.1 13.1 11.1 7. 11.1 11.1 11.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.0 0.0 MgO 0.0 0.0 0.0 2.0 2.0 2.0 2.0 0.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1. 0.0 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 2.5 2.5 2.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 0.1 0.1 0.1 2.0 2.0 2.0 2.0 0.1 0.1 0.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 35.2 35.2 35.2 35.2 35.2 35.2 35.2 35.2 37.2 35.2 R.sub.2O/Al.sub.2O.sub.3 0.78 0.78 0.78 0.98 1.55 0.78 0.78 0.98 1.09 0.98 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.29 1.29 1.29 0.92 0.59 1.14 1.14 1.02 0.92 1.02 Na.sub.2O/Li.sub.2O 2.58 1.44 0.86 3.05 1.58 2.58 0.86 1.76 1.76 1.76 Li.sub.2O/Al.sub.2O.sub.3 0.22 0.32 0.42 0.24 0.60 0.22 0.42 0.35 0.35 0.35 Q 20.80 21.80 22.80 20.00 16.00 23.00 25.00 18.00 23.20 21.20 X 382 528 674 279 365 382 673 420 425 425 Y 23 21 19 22 19 21 17 22 22 22 Z 14 35 56 6 4 10 52 20 19 19 W 217 358 499 125 218 220 503 263 263 263 U 7,815 7,865 7,914 7,619 6,714 8,122 8,221 7,722 7,325 7,442 (g/cm.sup.3) 2.443 2.440 2.437 2.470 2.475 2.473 2.466 2.424 2.464 2.563 Ts ( C.) 950 931 917 900 738 930 900 953 870 888 .sub.300-380 C. 71.3 69.9 67.6 82.9 95.5 71.7 68.8 82.7 93.4 80.5 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,592 1,567 1,541 1,560 1,423 1,555 1,506 1,612 1,569 1,487 E (GPa) 77 79 80 79 80 81 84 78 79 83 CS.sub.K (MPa) 1,411 1,397 1,376 1,533 905 1,515 1,460 1,488 1,302 1,549 DOL.sub.K (m) 19 16 11 17 15 13 6 23 26 14 CS.sub.Na (MPa) 152 216 324 185 213 174 290 266 207 196 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) 132 134 116 104 82 99 101 137 103 102 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 6.8 8.4 10.3 6.0 5.6 7.9 16.3 5.9 4.0 7.6 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00020 TABLE 20 Component (mol %) No. 184 No. 185 No. 186 No. 187 No. 188 No. 189 No. 190 No. 191 No. 192 No. 193 SiO.sub.2 62.955 59.055 58.955 58.955 60.055 60.055 59.955 59.955 61.055 60.955 Al.sub.2O.sub.3 17.8 19.8 19.8 17.8 19.8 17.8 19.8 17.8 18.8 18.8 B.sub.2O.sub.3 0.1 2.0 0.1 0.1 2.0 2.0 0.1 0.1 2.0 0.1 Li.sub.2O 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 Na.sub.2O 11.1 11.1 11.1 13.1 10.1 12.1 10.1 12.1 10.1 10.1 K.sub.2O 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MgO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.5 0.5 2.5 2.5 0.5 0.5 2.5 2.5 0.5 2.5 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 0.1 2.0 0.1 0.1 2.0 2.0 0.1 0.1 2.0 0.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 35.2 37.2 37.2 37.2 36.2 36.2 36.2 36.2 35.2 35.2 R.sub.2O/Al.sub.2O.sub.3 0.98 0.88 0.88 1.09 0.83 1.03 0.83 1.03 0.87 0.87 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.02 1.14 1.14 0.92 1.21 0.97 1.21 0.97 1.15 1.15 Na.sub.2O/Li.sub.2O 1.76 1.76 1.76 2.08 1.60 1.92 1.60 1.92 1.60 1.60 Li.sub.2O/Al.sub.2O.sub.3 0.35 0.32 0.32 0.35 0.32 0.35 0.32 0.35 0.34 0.34 Q 19.20 31.00 26.80 23.80 28.50 25.50 24.30 21.30 24.50 20.30 X 422 476 482 380 499 396 505 402 470 476 Y 22 21 22 22 21 21 22 22 21 22 Z 20 24 24 8 29 13 30 14 27 27 W 263 291 299 204 320 225 329 234 302 310 U 7,617 7,814 7,548 7,045 7,973 7,470 7,706 7,204 7,880 7,613 (g/cm.sup.3) 2.601 2.451 2.453 2.457 2.448 2.445 2.447 2.450 2.440 2.440 Ts ( C.) 884 882 913 871 890 855 924 889 890 923 .sub.300-380 C. 83.7 77.6 79.6 89.5 73.6 85.1 75 86.6 74.6 76.9 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,485 1,519 1,547 1,541 1,525 1,529 1,557 1,560 1,540 1,578 E (GPa) 82 78 78 77 79 74 79 77 78 78 CS.sub.K (MPa) 1,494 1,486 1,453 1,297 1,492 1,421 1,438 1,349 1,476 1,395 DOL.sub.K (m) 13 15 18 26 12 16 16 23 14 18 CS.sub.Na (MPa) 193 280 254 217 263 260 237 225 259 245 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na (m) 102 115 134 127 111 112 131 127 112 134 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 7.8 7.8 7.3 4.9 9.3 6.8 8.0 5.6 8.3 7.3 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00021 TABLE 21 Component (mol %) No. 194 No. 195 No. 196 No. 197 No. 198 No. 199 No. 200 No. 201 No. 202 No. 203 SiO.sub.2 59.055 70.005 63.205 62.695 67.895 63.376 61.965 60.277 60.242 60.173 Al.sub.2O.sub.3 18.8 10.0 14.3 15.5 8.1 15.7 17.2 18.9 18.9 18.9 B.sub.2O.sub.3 2.0 0.0 0.0 7.0 0.3 3.2 1.7 0.2 0.2 0.2 Li.sub.2O 6.3 10.0 13.5 7.0 0.0 3.6 5.4 7.2 7.2 7.2 Na.sub.2O 12.1 3.0 2.0 4.1 14.3 4.0 6.0 8.2 8.2 8.2 K.sub.2O 0.0 1.0 5.0 0.1 1.1 0.2 0.3 0.4 0.4 0.4 MgO 0.0 5.0 1.0 1.0 5.2 2.4 1.5 0.3 0.3 0.3 CaO 0.0 0.0 0.0 1.5 3.0 3.8 1.9 0.0 0.0 0.0 SrO 0.0 0.0 0.0 1.1 0.0 0.2 0.1 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 1.3 0.6 0.0 0.0 0.0 ZnO 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.070 0.105 0.174 ZrO.sub.2 0.0 1.0 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.04 0.00 0.00 0.00 0.10 0.07 0.06 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.5 0.0 0.0 0.0 0.0 2.1 3.2 4.3 4.3 4.3 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.000 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.0 5.0 1.0 9.5 8.5 9.4 5.1 0.5 0.5 0.5 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 37.2 24.0 34.8 26.7 23.5 23.5 28.9 34.7 34.7 34.7 R.sub.2O/Al.sub.2O.sub.3 0.98 1.40 1.43 0.72 1.90 0.50 0.68 0.84 0.84 0.84 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.02 0.53 0.67 1.05 0.34 1.01 1.09 1.17 1.17 1.17 Na.sub.2O/Li.sub.2O 1.92 0.30 0.15 0.59 1.11 1.11 1.14 1.14 1.14 Li.sub.2O/Al.sub.2O.sub.3 0.34 1.00 0.94 0.45 0.00 0.23 0.31 0.38 0.38 0.38 Q 29.50 14.51 14.70 11.06 20.75 2.20 7.59 18.56 18.60 18.67 X 425 577 898 546 224 406 487 570 570 570 Y 21 11 12 13 16 11 15 20 20 20 Z 16 54 95 50 69 26 34 42 42 42 W 243 520 766 411 292 271 340 405 405 405 U 7,563 7,754 7,154 8,715 7,272 8,996 8,317 7,614 7,611 7,605 (g/cm.sup.3) 2.450 2.427 2.447 2.403 2.467 2.465 2.433 2.404 2.403 2.404 Ts ( C.) 864 N.A. N.A. 839 798 902 902 922 921 921 .sub.300-380 C. 84.5 65.6 85 58.6 89.7 53.9 63 75.2 72.4 74.5 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,521 1,526 1,468 1,492 1,484 1,551 1,570 1,580 1,576 1,579 E (GPa) 78 N.A. N.A. N.A. N.A. N.A. N.A. 75 75 75 CS.sub.K (MPa) 1,433 N.A. N.A. N.A. 905 662 1,105 N.A. N.A. N.A. DOL.sub.K (m) 14 N.A. N.A. N.A. 25 N.A. 13 N.A. N.A. N.A. CS.sub.Na (MPa) 280 N.A. N.A. N.A. N.A. 112 272 N.A. N.A. 290 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. 48 138 N.A. N.A. N.A. DOC.sub.Na (m) 118 N.A. N.A. N.A. N.A. 79 95 N.A. N.A. N.A. CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. 6 15 N.A. N.A. N.A. DOC.sub.Na/DOL.sub.K 8.3 N.A. N.A. N.A. N.A. N.A. 7.3 N.A. N.A. N.A. Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00022 TABLE 22 Component (mol %) No. 204 No. 205 No. 206 No. 207 No. 208 No. 209 No. 210 No. 211 No. 212 No. 213 SiO.sub.2 64.42 64.507 69.417 69.047 66.227 61.647 65.647 56.647 63.647 68.817 Al.sub.2O.sub.3 13.4 11.7 11.1 12.4 11.26 25 21 25 23 13.63 B.sub.2O.sub.3 1.2 0.0 3.4 0.0 0.0 0.2 0.2 0.2 0.2 1.7 Li.sub.2O 3.5 10.6 8.3 10.9 10.27 6.5 6.5 6.5 6.5 7.51 Na.sub.2O 10.9 9.5 2.5 4.7 5.45 6.00 6.00 11.00 6.00 7.49 K.sub.2O 0.4 0.3 0.2 1.1 1.43 0.3 0.3 0.3 0.3 0.3 MgO 2.4 0.8 1.1 0.1 3.1 0.2 0.2 0.2 0.2 0.4 CaO 0.0 0.2 2.9 0.1 0.3 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 1.587 0.010 0.010 0.1 0.1 0.0 0.0 0.0 0.0 0.0 ZrO.sub.2 0.0 1.8 0.1 0.2 1.3 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.10 0.00 0.09 0.00 0.00 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 1.3 0.53 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 2.0 0.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.01 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.0 0.3 0.02 0.1 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 3.6 1.0 7.4 0.2 3.33 0.4 0.4 0.4 0.4 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 28.2 32.1 22.1 29.1 28.4 37.8 33.8 42.8 35.8 28.9 R.sub.2O/Al.sub.2O.sub.3 1.10 1.74 0.99 1.35 1.52 0.51 0.61 0.71 0.56 1.12 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.78 0.55 0.73 0.73 0.55 1.89 1.59 1.37 1.74 0.78 Na.sub.2O/Li.sub.2O 3.11 0.90 0.30 0.43 0.53 0.92 0.92 1.69 0.92 1.00 Li.sub.2O/Al.sub.2O.sub.3 0.26 0.91 0.75 0.88 0.91 0.26 0.31 0.26 0.28 0.55 Q 1.67 5.86 12.53 1.90 2.30 35.85 19.85 48.35 27.85 0.33 X 166 504 535 647 571 752 638 638 695 442 Y 20 17 10 16 13 21 21 22 21 19 Z 8 33 52 65 48 65 56 37 61 35 W 72 377 433 543 477 551 479 405 515 337 U 7,389 6,660 8,277 7,388 7,249 9,187 8,816 8,395 9,002 7,777 (g/cm.sup.3) 2.424 2.487 2.403 2.476 2.487 N.A. 2.434 2.477 2.451 2.391 Ts ( C.) 898 743 807 N.A. 787 N.A. N.A. N.A. N.A. N.A. .sub.300-380 C. 80.3 89.2 57.8 75.7 79.2 N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,601 1,420 1,537 1,516 1,469 N.A. 1,579 1,535 1,512 1,624 E (GPa) 73 82 79 82 83 N.A. 84 84 86 77 CS.sub.K (MPa) N.A. N.A. N.A. N.A. N.A. N.A. 1,276 633 1,312 904 DOL.sub.K (m) N.A. N.A. N.A. N.A. N.A. N.A. 11 13 8 20 CS.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. 207 192 206 313 CS30.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. 132 128 128 171 DOC.sub.Na (m) N.A. N.A. N.A. N.A. N.A. N.A. 108 115 103 88 CTcv.sub.Na (MPa) N.A. N.A. N.A. N.A. N.A. N.A. 40 45 38 47 DOC.sub.Na/DOL.sub.K N.A. N.A. N.A. N.A. N.A. N.A. 10.1 8.5 12.4 4.5 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00023 TABLE 23 Component (mol %) No. 214 No. 215 No. 216 No. 217 No. 218 No. 219 No. 220 No. 221 No. 222 No. 223 SiO.sub.2 64.817 68.517 64.817 67.217 64.817 68.817 64.817 68.817 64.817 67.117 Al.sub.2O.sub.3 17.63 15.63 15.63 15.63 15.63 15.63 15.63 15.63 15.63 15.63 B.sub.2O.sub.3 1.7 0.0 3.7 1.7 1.7 1.7 1.7 1.7 1.7 1.7 Li.sub.2O 7.51 7.51 7.51 7.51 7.51 5.51 9.51 7.51 7.51 7.51 Na.sub.2O 7.49 7.49 7.49 7.49 7.49 7.49 7.49 5.49 9.49 7.49 K.sub.2O 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.0 MgO 0.4 0.4 0.4 0.0 2.4 0.4 0.4 0.4 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 0.4 4.1 1.7 4.1 2.1 2.1 2.1 2.1 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 32.9 30.9 30.9 30.9 30.9 28.9 32.9 28.9 32.9 30.6 R.sub.2O/Al.sub.2O.sub.3 0.87 0.98 0.98 0.98 0.98 0.85 1.11 0.85 1.11 0.96 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.01 1.00 0.81 0.92 0.81 1.01 0.81 1.01 0.81 0.91 Na.sub.2O/Li.sub.2O 1.00 1.00 1.00 1.00 1.00 1.36 0.79 0.73 1.26 1.00 Li.sub.2O/Al.sub.2O.sub.3 0.43 0.48 0.48 0.48 0.48 0.35 0.61 0.48 0.48 0.48 Q 16.33 4.93 12.33 7.93 10.33 2.33 14.33 3.33 13.33 7.73 X 556 502 496 499 502 399 599 545 454 499 Y 19 20 18 20 17 21 18 19 20 19 Z 44 40 39 41 35 30 49 51 29 40 W 410 381 364 373 376 291 456 432 315 373 U 8,147 7,951 7,974 7,951 8,015 8,229 7,695 8,279 7,645 8,006 (g/cm.sup.3) 2.409 2.402 2.385 2.391 2.414 2.390 2.408 2.385 2.415 2.393 Ts ( C.) 929 N.A. 871 924 N.A. 964 N.A. 949 N.A. 921 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,588 1,653 1,571 1,630 1,560 1,662 1,550 1,638 1,575 1,618 E (GPa) 79 79 76 77 80 77 80 79 78 78 CS.sub.K (MPa) 1,284 1,243 1,082 1,153 1,202 1,135 982 1,126 991 1,185 DOL.sub.K (m) 20 27 21 25 16 24 17 20 21 23 CS.sub.Na (MPa) 329 314 328 318 331 235 387 351 326 322 CS30.sub.Na (MPa) 192 204 196 206 184 142 204 199 176 199 DOC.sub.Na (m) 95 108 98 110 89 99 83 91 87 100 CTcv.sub.Na (MPa) 60 74 56 65 53 43 62 59 50 68 DOC.sub.Na/DOL.sub.K 4.8 4.0 4.8 4.3 5.4 4.2 5.0 4.6 4.2 4.4 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00024 TABLE 24 Component (mol %) No. 224 No. 225 No. 226 No. 227 No. 228 No. 229 No. 230 No. 231 No. 232 SiO.sub.2 64.817 64.817 62.817 62.157 60.197 58.237 56.277 54.937 54.937 Al.sub.2O.sub.3 15.63 15.63 15.63 18.01 19.01 20.01 21.01 20.01 20.01 B.sub.2O.sub.3 1.7 1.7 1.7 1.7 1.7 1.7 1.7 5.0 5.0 Li.sub.2O 7.51 7.51 7.51 8.65 9.13 9.61 10.09 9.61 12.01 Na.sub.2O 7.49 7.49 7.49 8.63 9.11 9.59 10.07 9.59 7.19 K.sub.2O 2.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 MgO 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 2.0 4.0 0.0 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 2.1 2.1 2.1 2.1 2.1 2.1 5.4 5.4 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 32.9 30.9 30.9 35.6 37.6 39.5 41.5 39.5 39.5 R.sub.2O/Al.sub.2O.sub.3 1.11 0.98 0.98 0.98 0.98 0.97 0.97 0.97 0.97 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.81 0.90 0.90 0.92 0.92 0.93 0.93 0.80 0.80 Na.sub.2O/Li.sub.2O 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.60 Li.sub.2O/Al.sub.2O.sub.3 0.48 0.48 0.48 0.48 0.48 0.48 0.48 0.48 0.60 Q 12.33 7.93 7.53 24.12 30.76 37.40 44.04 44.00 45.20 X 502 502 505 598 639 681 723 675 850 Y 19 19 18 19 19 18 18 17 14 Z 40 40 39 44 46 48 50 47 72 W 373 373 373 430 454 478 502 463 633 U 7,670 7,707 7,452 7,850 7,802 7,755 7,707 7,775 7,835 (g/cm.sup.3) 2.413 2.385 2.377 2.418 2.428 2.436 2.444 2.424 2.420 Ts ( C.) 840 896 877 884 N.A. N.A. N.A. N.A. N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,596 1,614 1,604 1,546 N.A. N.A. N.A. N.A. N.A. E (GPa) 78 75 73 80 80 80 81 79 81 CS.sub.K (MPa) 926 1,000 864 1,264 1,297 1,336 1,347 1,240 1,139 DOL.sub.K (m) 27 27 30 21 20 19 19 16 12 CS.sub.Na (MPa) 280 270 248 405 418 456 496 463 655 CS30.sub.Na (MPa) 134 174 152 233 240 255 278 230 299 DOC.sub.Na (m) 77 108 99 92 92 90 90 79 75 CTcv.sub.Na (MPa) 37 59 52 72 74 76 80 63 72 DOC.sub.Na/DOL.sub.K 2.9 4.0 3.3 4.3 4.5 4.7 4.9 5.1 6.3 Acid resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A.

TABLE-US-00025 TABLE 25 No. No. No. No. No. Component (mol %) 233 234 235 236 237 SiO.sub.2 68.515 68.515 68.515 68.515 68.515 Al.sub.2O.sub.3 13.63 11.63 15.61 15.61 13.61 B.sub.2O.sub.3 2.0 4.0 1.5 3.5 3.5 Li.sub.2O 7.51 7.51 7.51 7.51 7.51 Na.sub.2O 7.49 7.49 6.01 4.01 6.01 K.sub.2O 0.3 0.3 0.3 0.3 0.3 MgO 0.4 0.4 0.4 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.4 4.4 1.9 3.9 3.9 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 28.9 26.9 29.4 27.4 27.4 R.sub.2O/Al.sub.2O.sub.3 1.12 1.32 0.89 0.76 1.02 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.87 0.74 1.10 1.28 0.96 Na.sub.2O/Li.sub.2O 1.00 1.00 0.80 0.53 0.80 Li.sub.2O/Al.sub.2O.sub.3 0.55 0.65 0.48 0.48 0.55 Q 0.93 3.07 4.15 3.15 0.15 X 442 381 533 575 472 Y 19 18 19 17 18 Z 35 30 48 59 43 W 336 291 417 467 372 U 7,778 7,605 8,193 8,523 8,020 (g/cm.sup.3) 2.3907 2.3857 2.3873 2.3698 2.3662 Ts ( C.) N.A. 746.5 948 923 871 .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,613 1,574 1,637 1,618 1,618.3 E (GPa) 77.4 77.1 78.6 77.7 75.1 CS.sub.K (MPa) 888 739 1,163 982 942 DOL.sub.K (m) 18 13 20 13 19 CS.sub.Na (MPa) 364 296 390 381 408 CS30.sub.Na (MPa) 170 119 201 166 180 DOC.sub.Na (m) 81 73 93 73 84 CTcv.sub.Na (MPa) 48 33 64 45 54 DOC.sub.Na/DOL.sub.K 4.5 5.6 4.6 5.6 4.4 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. No. No. No. No. No. Component (mol %) 238 239 240 241 242 SiO.sub.2 68.515 66.515 66.515 65.815 65.815 Al.sub.2O.sub.3 12.63 15.61 15.61 15.63 15.63 B.sub.2O.sub.3 6.0 1.5 2.5 1.7 1.7 Li.sub.2O 7.51 9.51 9.51 7.51 8.51 Na.sub.2O 4.49 6.01 5.01 7.49 7.49 K.sub.2O 0.3 0.3 0.3 1.3 0.3 MgO 0.4 0.4 0.4 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 6.4 1.9 2.9 2.1 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 24.9 31.4 30.4 31.9 31.9 R.sub.2O/Al.sub.2O.sub.3 0.97 1.01 0.95 1.04 1.04 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.99 0.96 1.03 0.94 0.94 Na.sub.2O/Li.sub.2O 0.60 0.63 0.53 1.00 0.88 Li.sub.2O/Al.sub.2O.sub.3 0.59 0.61 0.61 0.48 0.54 Q 2.57 10.15 9.65 10.33 11.33 X 475 633 654 501 549 Y 16 17 17 19 18 Z 49 58 63 40 45 W 388 500 525 373 415 U 8,186 7,926 8,091 7,816 7,828 (g/cm.sup.3) 2.3369 2.3938 2.3817 2.4033 2.4011 Ts ( C.) 856 N.A. N.A. 874 N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,614 1,588.7 1,584.4 1,598 1,583 E (GPa) 72.5 79 78.3 77.8 78.6 CS.sub.K (MPa) 825 1,104 1,105 1,035 1,051 DOL.sub.K (m) 16 19 17 25 20 CS.sub.Na (MPa) 365 623 493 329 403 CS30.sub.Na (MPa) 163 249 249 173 222 DOC.sub.Na (m) 75 80 87 86 89 CTcv.sub.Na (MPa) 44 74 72 51 66 DOC.sub.Na/DOL.sub.K 4.7 4.2 5.1 3.4 4.5 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A.

TABLE-US-00026 TABLE 26 No. No. No. No. No. Component (mol %) 243 244 245 246 247 SiO.sub.2 65.315 63.815 65.815 66.315 62.255 Al.sub.2O.sub.3 15.63 15.63 15.63 15.63 15.63 B.sub.2O.sub.3 1.7 1.7 1.7 1.7 1.7 Li.sub.2O 8.51 7.51 9.01 9.01 8.01 Na.sub.2O 7.49 7.49 7.49 7.49 7.49 K.sub.2O 1.3 1.8 0.3 1.8 0.8 MgO 0.4 0.4 0.4 0.4 0.4 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 2.1 2.1 2.1 2.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 32.9 32.4 32.4 33.9 31.9 R.sub.2O/Al.sub.2O.sub.3 1.11 1.07 1.07 1.17 1.04 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.88 0.91 0.91 0.84 0.94 Na.sub.2O/Li.sub.2O 0.88 1.00 0.83 0.83 0.94 Li.sub.2O/Al.sub.2O.sub.3 0.54 0.48 0.58 0.58 0.51 Q 12.83 12.83 12.33 13.33 14.39 X 550 504 573 573 530 Y 18 19 18 18 18 Z 45 39 47 47 42 W 415 373 435 436 394 U 7,726 7,612 7,805 7,761 7,511 (g/cm.sup.3) 2.4103 2.4086 2.4044 2.4176 2.402 Ts ( C.) 854.5 N.A. N.A. N.A. 875.5 .sub.300-380 C. N.A. N.A. N.A. N.A. 77.2 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,573 1,596 1,569 1,553 1,597 E (GPa) 78.5 77.6 78.7 N.A. 78.1 CS.sub.K (MPa) 938 959 1,002 N.A. 1,038 DOL.sub.K (m) 20 27 18 N.A. 23 CS.sub.Na (MPa) 361 359 496 N.A. 376 CS30.sub.Na (MPa) 175 142 217 N.A. 198 DOC.sub.Na (m) 79 81 78 N.A. 86 CTcv.sub.Na (MPa) 48 42 61 N.A. 56 DOC.sub.Na/DOL.sub.K 4.0 3.0 4.3 N.A. 3.7 Acid resistance N.A. N.A. N.A. N.A. 1.1 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. 0.6 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. 0.8 (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. 8.194622 No. No. No. No. No. Component (mol %) 248 249 250 251 252 SiO.sub.2 63.255 62.755 63.755 62.255 63.255 Al.sub.2O.sub.3 15.63 18.51 18.51 18.01 18.01 B.sub.2O.sub.3 1.7 0.0 0.0 0.0 0.0 Li.sub.2O 7.51 8.65 7.65 8.65 7.65 Na.sub.2O 7.49 8.63 8.63 8.63 8.63 K.sub.2O 0.8 0.8 0.8 0.8 0.8 MgO 0.4 1.0 1.0 1.0 1.0 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 1.0 1.0 1.0 1.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.4 36.6 35.6 36.1 35.1 R.sub.2O/Al.sub.2O.sub.3 1.01 0.98 0.92 1.00 0.95 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.96 0.97 1.02 0.94 1.00 Na.sub.2O/Li.sub.2O 1.00 1.00 1.13 1.00 1.13 Li.sub.2O/Al.sub.2O.sub.3 0.48 0.47 0.41 0.48 0.42 Q 12.39 23.82 20.82 22.82 19.82 X 504 616 566 603 553 Y 18 19 20 19 19 Z 39 44 40 43 38 W 373 448 406 439 397 U 7,621 7,872 8,005 7,738 7,872 (g/cm.sup.3) 2.3984 2.4372 2.4344 2.435 2.4313 Ts ( C.) 893.5 N.A. 932 N.A. N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,608 1,555 1,584 1,560 1,584 E (GPa) 77.4 81.6 81.2 81.5 81 CS.sub.K (MPa) 1,101 1,354 1,354 1,312 1,349 DOL.sub.K (m) 25 23 24 23 25 CS.sub.Na (MPa) 345 462 425 470 387 CS30.sub.Na (MPa) 177 220 223 240 192 DOC.sub.Na (m) 94 81 89 86 87 CTcv.sub.Na (MPa) 56 67 62 70 63 DOC.sub.Na/DOL.sub.K 3.8 3.5 3.7 3.7 3.5 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A.

TABLE-US-00027 TABLE 27 No. No. No. No. No. Component (mol %) 253 254 255 256 257 SiO.sub.2 62.255 62.255 62.055 61.855 61.255 Al.sub.2O.sub.3 18.51 18.51 19.01 19.01 18.51 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Li.sub.2O 8.65 7.65 9.15 8.15 8.65 Na.sub.2O 7.63 7.63 8.63 8.63 8.63 K.sub.2O 0.8 0.8 0.8 0.8 0.8 MgO 1.0 1.0 1.0 1.0 0.8 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 1.0 1.0 0.0 0.0 0.2 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 1.0 1.0 1.0 1.0 0.8 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 35.6 34.6 37.6 36.6 36.6 R.sub.2O/Al.sub.2O.sub.3 0.92 0.87 0.98 0.92 0.98 Al.sub.2O.sub.3/(R.sub.2O + RO) 1.02 1.08 0.97 1.02 0.98 Na.sub.2O/Li.sub.2O 0.88 1.00 0.94 1.06 1.00 Li.sub.2O/Al.sub.2O.sub.3 0.47 0.41 0.48 0.43 0.47 Q 21.62 19.62 27.02 25.22 25.08 X 641 592 655 606 618 Y 18 19 19 19 19 Z 50 45 48 43 45 W 477 435 477 436 447 U 7,859 7,905 7,878 7,906 7,710 (g/cm.sup.3) 2.4271 2.4241 2.4411 2.4384 2.4341 Ts ( C.) N.A. 939 N.A. 923 N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,559 1,582 1,539 1,558 1,559 E (GPa) 80.9 80.5 82.27 81.77 80.6 CS.sub.K (MPa) 1,278 1,269 1,359 1,388 1,321 DOL.sub.K (m) 23 23 21 23 24 CS.sub.Na (MPa) 478 409 471 409 347 CS30.sub.Na (MPa) 230 204 238 219 211 DOC.sub.Na (m) 85 84 84 89 99 CTcv.sub.Na (MPa) 66 59 69 65 67 DOC.sub.Na/DOL.sub.K 3.7 3.7 4.0 3.9 4.2 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A. No. No. No. No. No. Component (mol %) 258 259 260 261 262 SiO.sub.2 60.255 61.255 61.755 67.615 67.035 Al.sub.2O.sub.3 18.51 18.51 18.51 18.51 18.51 B.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Li.sub.2O 8.65 8.65 8.65 8.65 8.65 Na.sub.2O 8.63 8.63 8.63 8.63 8.63 K.sub.2O 0.8 0.8 0.8 0.8 0.8 MgO 0.6 1.0 1.0 1.0 1.0 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 1.0 2.0 SnO.sub.2 0.05 0.05 0.05 0.05 0.05 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.4 0.2 0.4 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 0.6 1.0 1.0 1.0 1.0 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 36.6 36.6 36.6 36.6 36.6 R.sub.2O/Al.sub.2O.sub.3 0.98 0.98 0.98 0.98 0.98 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.99 0.97 0.97 0.97 0.97 Na.sub.2O/Li.sub.2O 1.00 1.00 1.00 1.00 1.00 Li.sub.2O/Al.sub.2O.sub.3 0.47 0.47 0.47 0.47 0.47 Q 25.84 25.08 24.34 18.96 19.54 X 620 618 617 609 609 Y 19 19 19 20 20 Z 45 44 44 45 45 W 447 448 448 448 448 U 7,592 7,733 7,768 8,297 8,246 (g/cm.sup.3) 2.4313 2.4358 2.4345 2.4658 2.4942 Ts ( C.) N.A. N.A. N.A. N.A. N.A. .sub.300-380 C. N.A. N.A. N.A. N.A. N.A. (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,565 1,553 1,555 1,534 1,508 E (GPa) 80.6 81.2 81.0 82.2 83.0 CS.sub.K (MPa) 1,309 1,320 1,311 1,436 1,509 DOL.sub.K (m) 25 23 23 20 18 CS.sub.Na (MPa) 371 346 329 395 380 CS30.sub.Na (MPa) 225 217 209 223 232 DOC.sub.Na (m) 99 104 105 90 100 CTcv.sub.Na (MPa) 71 75 71 70 75 DOC.sub.Na/DOL.sub.K 3.9 4.5 4.5 4.4 5.5 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A.

TABLE-US-00028 TABLE 28 No. No. No. No. No. Component (mol %) 263 264 265 266 267 SiO.sub.2 66.022 65.853 65.784 65.765 65.794 Al.sub.2O.sub.3 18.51 18.51 10.97 12.50 14.05 B.sub.2O.sub.3 0.0 0.0 0.5 0.9 1.3 Li.sub.2O 8.65 8.65 7.95 7.97 7.99 Na.sub.2O 8.63 8.63 7.99 7.82 7.66 K.sub.2O 0.8 0.8 2.5 1.9 1.4 MgO 1.0 1.0 2.3 1.7 1.1 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.07 0.07 0.06 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 1.0 0.5 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 1.0 1.0 2.8 2.6 2.4 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 36.6 36.6 29.4 30.2 31.1 R.sub.2O/Al.sub.2O.sub.3 0.98 0.98 1.68 1.42 1.21 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.97 0.97 0.53 0.64 0.77 Na.sub.2O/Li.sub.2O 1.00 1.00 1.01 0.98 0.96 Li.sub.2O/Al.sub.2O.sub.3 0.47 0.47 0.72 0.64 0.57 Q 20.55 20.72 1.99 2.21 6.53 X 611 611 388 433 478 Y 20 20 16 17 18 Z 45 45 24 30 36 W 448 448 300 331 362 U 8,157 8,143 6,951 7,241 7,531 (g/cm.sup.3) 2.5256 2.4793 2.4261 2.4213 2.4136 Ts ( C.) 871 887 729 757 N.A. .sub.300-380 C. N.A. N.A. 88.3 84.5 80.9 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,499 1,526 1,501 1,538 1,574 E (GPa) 83.9 82.4 78.2 78.4 78.6 CS.sub.K (MPa) 1,454 1,394 657 751 870 DOL.sub.K (m) 17 19 18 18 19 CS.sub.Na (MPa) 336 361 119 161 244 CS30.sub.Na (MPa) 207 219 68 91 133 DOC.sub.Na (m) 102 98 93 90 88 CTcv.sub.Na (MPa) 63 68 19 27 38 DOC.sub.Na/DOL.sub.K 6.1 5.2 5.1 5.0 4.7 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) 0.88 N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy 9.232567 N.A. N.A. N.A. N.A. No. No. No. No. No. Component (mol %) 268 269 270 271 272 SiO.sub.2 65.763 65.752 65.741 66.605 63.995 Al.sub.2O.sub.3 15.31 13.65 14.31 14.97 15.50 B.sub.2O.sub.3 1.6 0.4 0.9 1.3 1.6 Li.sub.2O 8.01 2.03 4.03 6.02 7.61 Na.sub.2O 7.52 14.56 12.20 9.84 7.96 K.sub.2O 0.9 0.2 0.4 0.6 0.8 MgO 0.5 3.0 2.1 1.3 0.6 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.002 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.13 0.10 0.08 0.06 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.002 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0 0.1 0.1 0.1 MoO.sub.3 0.001 0.001 0.001 0.001 0.001 B.sub.2O.sub.3 + MgO + CaO 2.1 3.4 3.0 2.6 2.2 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.7 30.4 30.9 31.4 31.9 R.sub.2O/Al.sub.2O.sub.3 1.07 1.23 1.16 1.10 1.06 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.90 0.69 0.76 0.84 0.91 Na.sub.2O/Li.sub.2O 0.94 7.17 3.03 1.63 1.05 Li.sub.2O/Al.sub.2O.sub.3 0.52 0.15 0.28 0.40 0.49 Q 9.97 1.70 4.85 7.00 12.07 X 516 13 184 353 494 Y 19 23 21 20 19 Z 41 36 10 16 37 W 388 87 73 234 362 U 7,754 7,443 7,569 7,774 7,638 (g/cm.sup.3) 2.4047 2.4439 2.4333 2.419 2.4058 Ts ( C.) 863 869 852 852 N.A. .sub.300-380 C. 77.2 87.2 84.4 80.7 78 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,595 1,618 1,607 1,606 1,597 E (GPa) 78.0 74.4 77.4 76.8 77.8 CS.sub.K (MPa) 1,011 1,147 1,110 1,071 1,055 DOL.sub.K (m) 20 28 24 22 22 CS.sub.Na (MPa) 271 47 102 188 247 CS30.sub.Na (MPa) 165 32 66 120 160 DOC.sub.Na (m) 100 117 108 107 108 CTcv.sub.Na (MPa) 52 13 25 42 56 DOC.sub.Na/DOL.sub.K 4.9 4.2 4.6 4.9 5.0 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A.

TABLE-US-00029 TABLE 29 No. No. No. No. No. Component (mol %) 273 274 275 276 277 SiO.sub.2 63.495 63.995 63.995 63.995 68.200 Al.sub.2O.sub.3 15.63 15.63 15.63 15.63 9.50 B.sub.2O.sub.3 1.7 1.7 1.7 1.7 0.1 Li.sub.2O 8.01 8.01 8.01 8.01 8.00 Na.sub.2O 7.49 7.49 7.49 7.49 8.16 K.sub.2O 0.8 0.8 0.8 0.8 3.0 MgO 0.4 0.4 0.4 0.4 3.0 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.002 0.002 0.000 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.07 0.10 0.11 0.12 0.04 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.002 0.002 0.01 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.01 MoO.sub.3 0.002 0.003 0.004 0.005 0 B.sub.2O.sub.3 + MgO + CaO 2.1 2.1 2.1 2.1 3.1 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.9 31.9 31.9 31.9 28.7 R.sub.2O/Al.sub.2O.sub.3 1.04 1.04 1.04 1.04 2.02 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.94 0.94 0.94 0.94 0.43 Na.sub.2O/Li.sub.2O 0.94 0.94 0.94 0.94 1.02 Li.sub.2O/Al.sub.2O.sub.3 0.51 0.51 0.51 0.51 0.84 Q 13.15 12.65 12.65 12.65 8.36 X 528 528 528 528 344 Y 18 18 18 18 16 Z 42 42 42 42 19 W 394 394 394 394 274 U 7,619 7,663 7,663 7,663 6,896 (g/cm.sup.3) 2.403 2.4039 2.4047 2.4043 2.4264 Ts ( C.) 874 874 874 874 685 .sub.300-380 C. 77 77 77 77 95.9 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,591 1,591 1,591 1,591 1,435 E (GPa) 78 78 78 78 77.4 CS.sub.K (MPa) 1,057 1,055 1,072 1,059 473 DOL.sub.K (m) 22 22 22 22 20 CS.sub.Na (MPa) 304 287 258 299 175 CS30.sub.Na (MPa) 183 181 174 185 46 DOC.sub.Na (m) 98 104 115 101 62 CTcv.sub.Na (MPa) 57 61 62 61 13 DOC.sub.Na/DOL.sub.K 4.4 4.7 5.2 4.6 3.1 Acid resistance N.A. N.A. N.A. N.A. 0.0 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. 0.6 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. 0.79 (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. 8.06 No. No. No. No. No. Component (mol %) 278 279 280 281 282 SiO.sub.2 65.730 65.729 65.730 66.284 66.215 Al.sub.2O.sub.3 15.63 15.63 15.63 12.49 13.54 B.sub.2O.sub.3 1.7 1.7 1.7 0.8 1.1 Li.sub.2O 8.01 8.01 8.01 2.02 4.02 Na.sub.2O 7.57 7.57 7.57 13.24 11.33 K.sub.2O 0.8 0.8 0.8 1.2 1.1 MgO 0.4 0.4 0.4 3.7 2.6 CaO 0.0 0.0 0.0 0.0 0.0 SrO 0.0 0.0 0.0 0.0 0.0 BaO 0.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 TiO.sub.2 0.003 0.003 0.001 0.002 0.000 ZrO.sub.2 0.0 0.0 0.0 0.0 0.0 SnO.sub.2 0.05 0.05 0.05 0.13 0.10 Y.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.001 0.001 0.001 0.002 0.01 P.sub.2O.sub.5 0.0 0.0 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 0.0 0.0 Cl 0.1 0.1 0.1 0.1 0.01 MoO.sub.3 0.002 0.003 0.004 0.005 0.0 B.sub.2O.sub.3 + MgO + CaO 2.1 2.1 2.1 4.5 3.7 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 32.0 32.0 32.0 29.0 30.0 R.sub.2O/Al.sub.2O.sub.3 1.05 1.05 1.05 1.32 1.21 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.93 0.93 0.93 0.62 0.71 Na.sub.2O/Li.sub.2O 0.95 0.95 0.95 6.55 2.82 Li.sub.2O/Al.sub.2O.sub.3 0.51 0.51 0.51 0.16 0.30 Q 11.04 11.04 11.04 2.89 1.60 X 523 523 523 11 182 Y 19 19 19 21 20 Z 42 42 42 33 8 W 392 392 392 71 84 U 7,809 7,809 7,809 7,431 7,569 (g/cm.sup.3) 2.402 2.4028 2.4046 2.4421 2.4316 Ts ( C.) 864 860.5 864 841.5 835 .sub.300-380 C. 77.4 77.2 77.3 88.9 84.9 (10.sup.7/ C.) 10.sup.2.5 dPa .Math. s ( C.) 1,594.5 1,591.9 1,597.7 1,590 1,598 E (GPa) N.A. N.A. N.A. 74.4 76.3 CS.sub.K (MPa) 1,014 978 969 1,018 1,044 DOL.sub.K (m) 22 22 22 27 24 CS.sub.Na (MPa) 278 251 270 25 102 CS30.sub.Na (MPa) 176 161 171 21 61 DOC.sub.Na (m) 104 106 105 129 98 CTcv.sub.Na (MPa) 62 57 57 10 20 DOC.sub.Na/DOL.sub.K 4.6 4.9 4.8 4.8 4.1 Acid resistance N.A. N.A. N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A. N.A. N.A.

TABLE-US-00030 TABLE 30 Component (mol %) No. 283 No. 284 No. 285 SiO.sub.2 65.972 65.852 65.852 Al.sub.2O.sub.3 14.58 15.42 15.63 B.sub.2O.sub.3 1.4 1.6 1.7 Li.sub.2O 6.02 7.61 8.01 Na.sub.2O 9.41 7.87 7.49 K.sub.2O 0.9 0.8 0.8 MgO 1.5 0.6 0.4 CaO 0.0 0.0 0.0 SrO 0.0 0.0 0.0 BaO 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 TiO.sub.2 0.002 0.002 0.001 Zro.sub.2 0.0 0.0 0.0 SnO.sub.2 0.08 0.06 0.1 Y.sub.2O.sub.3 0.0 0.0 0.0 La.sub.2O.sub.3 0.0 0.0 0.0 Fe.sub.2O.sub.3 0.002 0.002 0.001 P.sub.2O.sub.5 0.0 0.0 0.0 SO.sub.3 0.0 0.0 0.0 Cl 0.1 0.1 0.1 MoO.sub.3 0.002 0.003 0.004 B.sub.2O.sub.3 + MgO + CaO 2.90 2.26 2.10 Al.sub.2O.sub.3 + Li.sub.2O + Na.sub.2O + K.sub.2O 31.0 31.7 31.9 R.sub.2O/Al.sub.2O.sub.3 1.12 1.06 1.04 Al.sub.2O.sub.3/(R.sub.2O + RO) 0.82 0.91 0.94 Na.sub.2O/Li.sub.2O 1.56 1.03 0.94 Li.sub.2O/Al.sub.2O.sub.3 0.41 0.49 0.51 Q 6.26 9.91 10.79 X 354 491 525 Y 20 19 19 Z 17 37 42 W 239 363 394 U 7,692 7,796 7,825 (g/cm.sup.3) 2.4181 2.4055 2.4041 Ts ( C.) 841.5 866 867.5 .sub.300-380 C. 81.6 77.6 77.4 (10.sup.7/ C.) 10.sup.2.5 dPa's ( C.) 1,602 1,599 1,596 E (GPa) 77.1 77.5 N.A. CS.sub.K (MPa) 1,035 1,054 1,006 DOL.sub.K (m) 22 21 21 CS.sub.Na (MPa) 182 264 246 CS30.sub.Na (MPa) 115 164 159 DOC.sub.Na (m) 105 102 108 CTcv.sub.Na (MPa) 39 55 58 DOC.sub.Na/DOL.sub.K 4.8 4.7 5.1 Acid resistance N.A. N.A. N.A. 5 wt % HCl 80 C. 24 h (mg/cm.sup.2) Alkali resistance N.A. N.A. N.A. 5 wt % NaOH 80 C. 6 h (mg/cm.sup.2) K1c (SEPB) N.A. N.A. N.A. (MPam.sup.0.5) Fracture energy N.A. N.A. N.A.

[0176] Samples in the tables were each produced as described below. First, glass raw materials were blended so as to give a glass composition shown in the table, and were melted at 1, 600 C. for 21 hours with a platinum pot. Subsequently, the resultant molten glass was poured out on a carbon sheet to be formed into a flat sheet shape, and was then cooled in a temperature region of from an annealing point to a strain point at a rate of 3 C./min. Thus, a glass sheet (glass sheet to be tempered) was obtained. The surface of the resultant glass sheet was optically polished so as to give a sheet thickness of 1.5 mm, and was then evaluated for various characteristics.

[0177] The density () is a value measured by a well-known Archimedes method.

[0178] The softening point (Ts) is a value measured based on a method of ASTM C338.

[0179] The thermal expansion coefficient (@30-380 C.) at from 30 C. to 380 C. is a value measured for an average thermal expansion coefficient with a dilatometer.

[0180] The temperature (10.sup.2.5 dPa.Math.s) at a viscosity at high temperature of 10.sup.2.5 dPa.Math.s is a value measured by a platinum sphere pull up method.

[0181] The Young's modulus (E) is a value calculated by a method in conformity with JIS R 1602-1995 Testing methods for elastic modulus of fine ceramics.

[0182] Subsequently, each of the untempered glass sheets (glass sheets to be tempered) was subjected to ion exchange treatment by being immersed in a KNO.sub.3 molten salt at 430 C. for 4 hours. Thus, a tempered glass sheet having a compressive stress layer in a surface thereof was obtained. After that, the glass surface was washed, and the compressive stress value (CSK) of the compressive stress layer on the outermost surface and the depth of layer (DOL.sub.K) thereof were calculated based on the number of interference fringes observed with a surface stress meter FSM-6000 (manufactured by Orihara Industrial Co., Ltd.) and intervals therebetween. Herein, the DOL.sub.K is the depth of the compressive stress layer obtained through ion exchange with the KNO.sub.3 molten salt.

[0183] In addition, each of the untempered glass sheets (glass sheets to be tempered) was subjected to ion exchange treatment by being immersed in a NaNO.sub.3 molten salt at 380 C. for 1 hour. Thus, a tempered glass sheet was obtained. After that, the glass surface was washed, and the compressive stress value (CS.sub.Na) of a compressive stress layer on the outermost surface, the compressive stress value (CS30Na) thereof at a depth of 30 m, the depth of compression (DOC.sub.Na) thereof, and the internal tensile stress value (CTcv.sub.Na) thereof were calculated from a retardation distribution curve observed with a scattered light photoelastic stress meter SLP-2000 (manufactured by Orihara Industrial Co., Ltd.). Herein, the DOC.sub.Na is the depth of the compressive stress layer obtained through ion exchange with the NaNO.sub.3 molten salt, and is a depth at which the stress value becomes zero.

[0184] In an acid resistance test, acid resistance was evaluated as described below. A glass sample having been subjected to mirror polishing treatment on both sides so as to give dimensions of 50 mm10 mm1.0 mm was used as a measurement sample. The sample was sufficiently washed with a neutral detergent and pure water, and was then immersed in a 5 mass % HCl aqueous solution warmed to 80 C. for 24 hours. A mass loss (mg/cm.sup.2) per unit surface area before and after the immersion was calculated.

[0185] In an alkali resistance test, alkali resistance was evaluated as described below. A glass sample having been subjected to mirror polishing treatment on both sides so as to give dimensions of 50 mm10 mm1.0 mm was used as a measurement sample. The sample was sufficiently washed with a neutral detergent and pure water, and was then immersed in a 5 mass % NaOH aqueous solution warmed to 80 C. for 6 hours. A mass loss (mg/cm.sup.2) per unit surface area before and after the immersion was calculated.

[0186] The fracture toughness (K1c) is a value measured by a SEPB method based on JIS R 1607 Testing methods for fracture toughness of fine ceramics. The fracture toughness value of each of the samples was determined as an average for 3 points.

[0187] As apparent from Tables 1 to 30, each of the tempered glass sheets of Samples Nos. 001 to 102 and Nos. 104 to 285 had a proper content of [B.sub.2O.sub.3]+[MgO]+[CaO] and a proper molar ratio ([Li.sub.2O]+[Na.sub.2O]+[K.sub.2O])/[Al.sub.2O.sub.3], and hence had a compressive stress value (CS.sub.Na) of the compressive stress layer on the outermost surface and a compressive stress value (CS30.sub.Na) thereof at a depth of 30 m from the outermost surface as high as 202 MPa or more and 41 MPa or more, respectively, when having been subjected to ion exchange treatment with NaNO.sub.3. Accordingly, it is conceived that a stress profile having an inflection point as shown in FIG. 3 is easily made, and each of the tempered glass sheets is less liable to be broken than that of Sample No. 103 serving as Comparative Example at the time of dropping.

[0188] Further, when the glass sheet (glass sheet to be tempered) according to No. 071 was immersed in a NaNO.sub.3 molten salt at 380 C. for 4.5 hours, and was then immersed in a KNO.sub.3 molten salt at 430 C. for 30 minutes, it was recognized that the compressive stress value CS of the compressive stress layer on the outermost surface and the compressive stress value CS30 thereof at a depth of 30 m from the outermost surface were 768 MPa and 148 MPa, respectively, and were further improved.

[0189] In addition, when the glass sheet (glass sheet to be tempered) according to No. 106 was immersed in a NaNO.sub.3 molten salt at 380 C. for 2 hours, and was then immersed in a 92.5 mass % KNO.sub.3 and 7.5 mass % NaNO.sub.3 mixed molten salt at 410 C. for 24 minutes, it was recognized that the compressive stress value CS of the compressive stress layer on the outermost surface and the compressive stress value CS30 thereof at a depth of 30 m from the outermost surface were 873 MPa and 154 MPa, respectively, and were further improved.

[0190] In addition, when the glass sheet (glass sheet to be tempered) according to No. 247 was immersed in a NaNO.sub.3 molten salt at 380 C. for 77 minutes, and was then immersed in a 92.5 mass % KNO.sub.3 and 7.5 mass % NaNO.sub.3 mixed molten salt at 410 C. for 25 minutes, it was recognized that the compressive stress value CS of the compressive stress layer on the outermost surface and the compressive stress value CS30 thereof at a depth of 30 m from the outermost surface were 878 MPa and 167 MPa, respectively, and were further improved.

EXAMPLE 2

[0191] An untempered glass sheet (glass sheet to be tempered) having the same composition as that of Sample No. 071 of Example 1 and having a thickness of 0.7 mm was immersed in a NaNO.sub.3 molten salt at 380 C. for 540 minutes, and was then immersed in a KNO.sub.3 molten salt at 430 C. for a time period shown in Table 31. Thus, a tempered glass sheet was obtained.

[0192] Further, the resultant tempered glass sheet was measured for its stress profile with a scattered light photoelastic stress meter SLP-2000 (manufactured by Orihara Industrial Co., Ltd.) and a surface stress meter FSM-6000 (manufactured by Orihara Industrial Co., Ltd.). FIG. 4 is a graph showing the general view of stress profiles of Examples 2-1 to 2-3, and FIG. 5 is a graph showing low compressive stress regions in the stress profiles of FIG. 4 in an enlarged manner. The stress profile of the tempered glass sheet on one of main surfaces thereof is shown in each of FIG. 4 and FIG. 5, but a similar stress profile was observed also on the other surface thereof.

[0193] The tempering conditions and glass characteristics of Examples 2-1 to 2-3 are shown in Table 31. In the table, the term SPP-4PB means abraded four-point bending strength.

TABLE-US-00031 TABLE 31 Example number 2-1 2-2 2-3 Thickness (mm) 0.7 0.7 0.7 First ion Molten salt for NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 exchange tempering Temperature of 380 380 380 molten salt ( C.) Tempering time 540 540 540 period (min) Second ion Molten salt for KNO.sub.3 KNO.sub.3 KNO.sub.3 exchange tempering Temperature of 430 430 430 molten salt (C) Tempering time 15 30 45 period (min) CS (MPa) 853 815 772 De (m) 3.4 5.1 5.9 DOC (m) 125 132 134 CT (MPa) 94 91 89 CS30 (MPa) 189 158 148 CS50 (MPa) 121 114 111 SPP-4PB (MPa) 227 206 199

[0194] For each of the samples (Examples 2-1 to 2-3), the glass surface was washed, and the compressive stress value (CS) of a compressive stress layer on the outermost surface and the depth De of an inflection point were calculated with a surface stress meter FSM-6000 (manufactured by Orihara Industrial Co., Ltd.). In the table, the value of the depth (De) of the inflection point represents the value of the diffusion depth DOL of a K ion obtained with FSM-6000 (De=DOL). In such a tempered glass sheet as those of Examples 2-1 to 2-3 of the present invention, that is, a tempered glass sheet in which a Li ion in the glass and a Na ion in the molten salt have been exchanged (K ion has not been exchanged) through first ion exchange, and a Na ion in the glass and a K ion in the molten salt have been exchanged through second ion exchange, the depth De of the inflection point e roughly coincides with the diffusion depth DOL of a K ion.

[0195] In addition, the compressive stress values (CS30 and CS50) of the compressive stress layer at depths of 30 m and 50 m, the depth of compression (DOC) thereof, and the internal tensile stress value (CT) thereof were calculated from a retardation distribution curve observed with a scattered light photoelastic stress meter SLP-2000 (manufactured by Orihara Industrial Co., Ltd.).

[0196] The abraded four-point bending strength was measured by the following procedure. First, the glass was abraded by the following procedure. The tempered glass sheet having been processed into a size of 50 mm50 mm and a thickness shown in Table 31 was fixed to a SUS plate having a thickness of 1.5 mm under the state in which the tempered glass sheet was turned vertically, and the tip of a pendular arm was caused to collide with the glass sheet through P180 grid sandpaper to abrade the glass sheet. The tip of the arm is an iron-made cylinder of 5 mm, and the arm has a weight of 550 g. The height from which the arm was swung down was set to 5 mm from a collision point. Next, the abraded sample was measured for strength by being subjected to a four-point bending test according to JIS R 1601 (1995).

[0197] As apparent from Table 31 and FIG. 4 and FIG. 5, in each of the tempered glass sheets of Examples 2-1 to 2-3 had a compressive stress value (CS) of the compressive stress layer on the outermost surface and a compressive stress value (CS30) thereof at a depth of 30 m from the outermost surface as high as 815 MPa or more and 148 MPa or more, respectively. In addition, the abraded four-point bending strength is as high as 199 MPa or more, and hence it is conceived that each of the tempered glass sheets is less liable to be broken at the time of dropping.

EXAMPLE 3

[0198] An untempered glass sheet (glass sheet to be tempered) having the same composition as that of each of Samples No. 106 and No. 247 of Example 1 and having a thickness of 0.7 mm was immersed in a NaNO.sub.3 molten salt at 380 C. for a time period shown in Table 32, and was then immersed in a KNO.sub.3 molten salt at 430 C. for a time period shown in Table 32. Thus, a tempered glass sheet was obtained.

[0199] Further, the resultant tempered glass sheet was measured for its stress profile by the same method as in Example 2. FIG. 6 is a graph showing the general view of stress profiles of Examples 3-1 and 3-2, and FIG. 7 is a graph showing low compressive stress regions in the stress profiles of FIG. 6 in an enlarged manner.

[0200] The tempering conditions and glass characteristics of Examples 3-1 and 3-2 are shown in Table 32.

TABLE-US-00032 TABLE 32 Example number 3-1 3-2 Sample No. No. 106 No. 247 Thickness (mm) 0.7 0.7 First ion Molten salt for NaNO.sub.3 NaNO.sub.3 exchange tempering Temperature of 380 380 molten salt ( C.) Tempering time 120 210 period (min) Second ion Molten salt for KNO.sub.3 KNO.sub.3 exchange tempering Temperature of 410 410 molten salt ( C.) Tempering time 24 25 period (min) CS (MPa) 892 898 De (m) 5.5 5.8 DOC (m) 127 126 CT (MPa) 95 93 CS30 (MPa) 146 156 CS50 (MPa) 111 118 SPP-4PB (MPa) 206 199

[0201] Each of the samples (Examples 3-1 and 3-2) was measured for the stress values and the depth of compression, and was then measured for the abraded four-point bending strength by the same methods as in Example 2.

[0202] As apparent from Table 32 and FIG. 6 and FIG. 7, each of the tempered glass sheets of Examples 3-1 and 3-2 had a compressive stress value (CS) of the compressive stress layer on the outermost surface and a compressive stress value (CS30) thereof at a depth of 30 m from the outermost surface as high as 892 MPa or more and 146 MPa or more, respectively. In addition, the abraded four-point bending strength is as high as 199 MPa or more, and hence it is conceived that each of the tempered glass sheets is less liable to be broken at the time of dropping.

EXAMPLE 4

[0203] An untempered glass sheet (glass sheet to be tempered) having the same composition as that of Sample No. 277 of Example 1 and having a thickness of 0.7 mm was immersed in a NaNO.sub.3 molten salt at 380 C. for a time period shown in Table 33, and was then immersed in a KNO.sub.3 molten salt at 430 C. for a time period shown in Table 33. Thus, a tempered glass sheet was obtained.

[0204] Further, the resultant tempered glass sheet was measured for its stress profile by the same method as in Example 2. FIG. 8 is a graph showing the general view of stress profiles of Examples 4-1 to 4-4, and FIG. 9 is a graph showing low compressive stress regions in the stress profiles of FIG. 8 in an enlarged manner.

[0205] The tempering conditions and glass characteristics of Examples 4-1 to 4-4 are shown in Table 33.

TABLE-US-00033 TABLE 33 Example number 4-1 4-2 4-3 4-4 Sample No. No. 277 Thickness (mm) 0.7 0.7 0.7 0.7 First ion Molten salt for NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 exchange tempering Temperature of 380 380 380 380 molten salt ( C.) Tempering time 2,780 600 4,320 2,780 period (min) Second ion Molten salt for KNO.sub.3 KNO.sub.3 KNO.sub.3 KNO.sub.3 exchange tempering Temperature of 380 380 380 380 molten salt ( C.) Tempering time 105 150 105 210 period (min) CS (MPa) 739 735 766 713 De (m) 6.6 7.0 6.6 8.8 DOC (m) 120 98 124 120 CT (MPa) 62 42 64 64 CS30 (MPa) 113 91 107 99 CS50 (MPa) 83 58 80 74 SPP-4PB (MPa) 167 152 163 158

[0206] Each of the samples (Examples 4-1 to 4-4) was measured for the stress values and the depth of compression, and was then measured for the abraded four-point bending strength by the same methods as in Example 2.

[0207] As apparent from Table 33 and FIG. 8 and FIG. 9, the tempered glass sheet of Example 4-1 had a compressive stress value (CS) of the compressive stress layer on the outermost surface and a compressive stress value (CS30) thereof at a depth of 30 m from the outermost surface as high as 739 MPa and 113 MPa, respectively. In addition, the abraded four-point bending strength is as high as 167 MPa, and hence it is conceived that the tempered glass sheet is less liable to be broken at the time of dropping.

EXAMPLE 5

[0208] An Untempered glass sheet (glass sheet to be tempered) having the same composition as that of the sample described in Example 1 (the number of the sample is shown in each of Tables 34 to 41) and having a thickness of 0.7 mm was immersed in a molten salt shown in each of Tables 34 to 41 for a time period shown therein. Thus, a tempered glass sheet having been subjected to two-step ion exchange was obtained.

[0209] The tempering conditions and glass characteristics of Examples 5-1 to 5-86 are shown in Tables 34 to 41.

TABLE-US-00034 TABLE 34 Example number 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 Sample No. No. 001 No. 008 No. 036 No. 038 No. 044 No. 051 No. 053 No. 055 No. 065 No. 067 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 240 300 180 180 90 150 210 300 270 270 period (min) Second Molten salt 100/0 100/0 100/0 100/0 100/0 100/0 100/0 100/0 100/0 100/0 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 430 430 430 430 430 430 430 430 430 430 molten salt ( C.) Tempering time 30 30 60 75 30 45 75 75 30 30 period (min) CS30.sub.1st (MPa) 163 163 155 159 153 217 212 231 167 181 CS30.sub.2nd (MPa) 116 95 68 74 77 92 80 125 106 107 CS30.sub.Drop (MPa) 47 68 86 85 76 124 132 106 61 75 CS30.sub.Drop rate 0.29 0.42 0.56 0.53 0.50 0.57 0.62 0.46 0.36 0.41 DOC.sub.Na/DOL.sub.K 4.8 5.1 7.1 8.0 6.1 6.6 8.7 9.0 5.7 5.9

TABLE-US-00035 TABLE 35 Example number 5-11 5-12 5-13 5-14 5-15 5-16 5-17 5-18 5-19 5-20 Sample No. No. 068 No. 069 No. 071 No. 072 No. 073 No. 074 No. 075 No. 076 No. 077 No. 078 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 180 180 210 150 180 300 450 180 210 180 period (min) Second Molten salt 100/0 100/0 100/0 100/0 100/0 97.5/2.5 100/0 100/0 100/0 100/0 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 430 430 430 430 430 380 430 430 430 430 molten salt ( C.) Tempering time 45 60 45 45 45 180 45 60 60 45 period (min) CS30.sub.1st (MPa) 195 207 187 213 230 177 207 180 192 195 CS30.sub.2nd (MPa) 107 92 118 84 109 106 137 81 96 98 CS30.sub.Drop (MPa) 89 115 69 129 121 71 70 98 96 97 CS30.sub.Drop rate 0.45 0.56 0.37 0.61 0.53 0.40 0.34 0.55 0.50 0.50 DOC.sub.Na/DOL.sub.K 6.9 7.1 6.9 6.8 7.1 6.3 6.5 8.7 7.7 7.5

TABLE-US-00036 TABLE 36 Example number 5-21 5-22 5-23 5-24 5-25 5-26 5-27 5-28 5-29 5-30 Sample No. No. 079 No. 080 No. 081 No. 084 No. 085 No. 086 No. 087 No. 088 No. 089 No. 090 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 210 120 150 240 300 240 360 240 240 180 period (min) Second Molten salt 100/0 100/0 100/0 95/5 95/5 95/5 95/5 95/5 95/5 95/5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 430 430 430 410 410 410 410 410 410 410 molten salt ( C.) Tempering time 45 30 45 60 90 120 105 60 75 60 period (min) CS30.sub.1st (MPa) 201 140 188 171 199 214 205 203 227 221 CS30.sub.2nd (MPa) 107 78 79 108 108 122 111 137 133 137 CS30.sub.Drop (MPa) 94 62 109 63 92 93 94 65 94 85 CS30.sub.Drop rate 0.47 0.44 0.58 0.37 0.46 0.43 0.46 0.32 0.41 0.38 DOC.sub.Na/DOL.sub.K 7.0 6.9 7.5 7.1 7.0 8.1 7.6 7.1 6.7 8.0

TABLE-US-00037 TABLE 37 Example number 5-31 5-32 5-33 5-34 5-35 5-36 5-37 5-38 5-39 5-40 Sample No. No. 091 No. 092 No. 093 No. 093 No. 098 No. 208 No. 208 No. 213 No. 214 No. 215 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 240 240 240 240 180 120 120 240 240 120 period (min) Second Molten salt 95/5 95/5 95/5 100/0 92.5/7.5 92.5/7.5 92.5/7.5 97.5/2.5 97.5/2.5 97.5/2.5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 410 410 410 380 380 410 410 410 410 410 molten salt ( C.) Tempering time 90 75 60 120 55 24 24 30 30 30 period (min) CS30.sub.1st (MPa) 191 205 190 267 205 196 196 176 218 200 CS30.sub.2nd (MPa) 103 124 120 164 158 143 146 138 152 125 CS30.sub.Drop (MPa) 88 81 70 102 48 54 51 38 66 75 CS30.sub.Drop rate 0.46 0.40 0.37 0.38 0.23 0.27 0.26 0.22 0.30 0.38 DOC.sub.Na/DOL.sub.K 8.8 7.5 7.5 6.0 4.5 4.5 4.2 4.5 4.8 4.0

TABLE-US-00038 TABLE 38 Example number 5-41 5-42 5-43 5-44 5-45 5-46 5-47 5-48 5-49 5-50 Sample No. No. 216 No. 217 No. 218 No. 219 No. 221 No. 222 No. 223 No. 224 No. 225 No. 226 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 180 120 240 180 180 240 120 180 240 120 period (min) Second Molten salt 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 92.5/7.5 97.5/2.5 97.5/2.5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 410 410 410 410 410 410 410 410 410 410 molten salt ( C.) Tempering time 30 15 45 30 45 30 30 25 30 15 period (min) CS30.sub.1st (MPa) 192 200 207 148 202 176 196 168 182 159 CS30.sub.2nd (MPa) 144 151 141 90 131 133 128 147 99 125 CS30.sub.Drop (MPa) 47 50 66 57 71 43 68 21 83 34 CS30.sub.Drop rate 0.25 0.25 0.32 0.39 0.35 0.24 0.35 0.13 0.46 0.21 DOC.sub.Na/DOL.sub.K 4.8 4.3 5.4 4.2 4.6 4.2 4.4 2.9 4.0 3.3

TABLE-US-00039 TABLE 39 Example number 5-51 5-52 5-53 5-54 5-55 5-56 5-57 5-58 5-59 5-60 Sample No. No. 227 No. 228 No. 229 No. 230 No. 231 No. 232 No. 233 No. 235 No. 236 No. 237 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 180 180 240 180 240 360 180 120 180 180 period (min) Second Molten salt 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 410 410 410 410 410 410 410 410 410 410 molten salt ( C.) Tempering time 30 30 30 45 45 75 25 25 60 25 period (min) CS30.sub.1st (MPa) 245 264 277 295 268 337 173 197 192 187 CS30.sub.2nd (MPa) 175 175 210 211 211 246 126 127 118 130 CS30.sub.Drop (MPa) 70 89 67 84 57 91 46 70 74 57 CS30.sub.Drop rate 0.29 0.34 0.24 0.28 0.21 0.27 0.27 0.36 0.39 0.31 DOC.sub.Na/DOL.sub.K 4.3 4.5 4.7 4.9 5.1 6.3 4.6 4.5 5.7 4.4

TABLE-US-00040 TABLE 40 Example number 5-61 5-62 5-63 5-64 5-65 5-66 5-67 5-68 5-69 5-70 Sample No. No. 238 No. 239 No. 240 No. 241 No. 242 No. 243 No. 244 No. 245 No. 247 No. 248 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 180 180 180 180 180 180 240 180 90 180 period (min) Second Molten salt 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 97.5/2.5 92.5/7.5 97.5/2.5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 410 410 410 410 410 410 410 410 410 410 molten salt ( C.) Tempering time 30 30 45 15 25 25 20 30 25 15 period (min) CS30.sub.1st (MPa) 176 241 250 189 222 194 184 215 187 185 CS30.sub.2nd (MPa) 122 168 157 140 156 154 136 134 151 139 CS30.sub.Drop (MPa) 54 73 93 49 66 40 48 81 36 46 CS30.sub.Drop rate 0.31 0.30 0.37 0.26 0.30 0.21 0.26 0.38 0.19 0.25 DOC.sub.Na/DOL.sub.K 4.6 4.3 5.0 3.4 4.4 3.9 3.0 4.3 3.7 3.8

TABLE-US-00041 TABLE 41 Example number 5-71 5-72 5-73 5-74 5-75 5-76 5-77 Sample No. No. 249 No. 250 No. 252 No. 253 No. 254 No. 255 No. 256 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 0.7 0.7 First Molten salt 0/100 0/100 0/100 0/100 0/100 0/100 0/100 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 380 380 molten salt ( C.) Tempering time 90 90 90 90 90 90 90 period (min) Second Molten salt 92.5/7.5 92.5/7.5 92.5/7.5 92.5/7.5 92.5/7.5 92.5/7.5 92.5/7.5 ion for tempering exchange (KNO.sub.3/NaNO.sub.3) Temperature of 410 410 410 410 410 410 410 molten salt ( C.) Tempering time 30 30 30 30 30 35 35 period (min) CS30.sub.1st (MPa) 246 215 206 226 210 251 225 CS30.sub.2nd (MPa) 199 168 157 173 162 200 191 CS30.sub.Drop (MPa) 47 47 49 53 48 51 34 CS30.sub.Drop rate 0.19 0.22 0.24 0.24 0.23 0.20 0.15 DOC.sub.Na/DOL.sub.K 3.6 3.7 3.5 3.7 3.6 3.9 3.9

[0210] For each of the resultant samples (Examples 5-1 to 5-86), the tempered glass sheet after first ion exchange was measured for its compressive stress value (CS30.sub.1st) at a depth of 30 m, and the tempered glass sheet after second ion exchange was measured for its compressive stress value (CS30.sub.2nd) at a depth of 30 m with a scattered light photoelastic stress meter SLP-2000 (manufactured by Orihara Industrial Co., Ltd.), and a compressive stress drop rate (CS30.sub.Droprate) at a depth of 30 m was calculated.

[0211] As apparent from Tables 34 to 41, each of the tempered glass sheets of Examples 5-1 to 5-86 had a compressive stress drop rate (CS30.sub.Droprate) as low as 0.61 or less. It is conceived that a stress profile having an inflection point as illustrated in FIG. 3 is easily made, and each of the tempered glass sheets is less liable to be broken at the time of dropping.

EXAMPLE 6

[0212] Each of Samples No. 055, No. 072, No. 106, No. 116, and No. 247 of Example 1 was measured for a Na ion mutual diffusion coefficient D.sub.Na and a K ion mutual diffusion coefficient D.sub.K.

[0213] First, a glass sheet to be tempered having the same composition as that of each of the above-mentioned samples was prepared, and was ion exchanged with 100% NaNO.sub.3 at 380 C. for a time period t shown in Table 42. Thus, a tempered glass sheet was obtained. After that, a Na ion concentration distribution on a cut surface thereof was measured through EPMA line scan. The EPMA measurement was performed by using JXA-8100 manufactured by JEOL Ltd. and by setting an acceleration voltage to 15 kV, a current to 500 nA, a measurement pitch to 0.82 m, and an electron beam diameter to 2 m.

[0214] The resultant ion concentration distribution was approximated to a curve through use of an analytical solution of Fick's laws of diffusion. Specifically, the concentration distribution at a tempering time period t obtained with an EPMA was normalized through use of a Na ion concentration C.sub.max on the outermost surface (x=0) and a Na ion concentration C.sub.min in a deep region (x=+), and the respective values were then input into the above-mentioned equation of [Math. 1] so as to achieve fitting to the complementary error function erfc(x/4Dt), and the value of D was derived through use of a least squares method and used as a mutual diffusion coefficient D.sub.Na. The Na ion concentration C.sub.min in the deep region (x=+) was set to an average of Na ion concentrations at depths of from 300 m to 400 m. Plots of the measurement values of Na ion concentrations, which had been measured with an EPMA for a tempered glass sheet obtained by subjecting Sample No. 247 to ion exchange under the conditions shown in Table 42, and the result obtained by approximating the measurement values to the complementary error function are shown in FIG. 10.

[0215] The K ion mutual diffusion coefficient D.sub.K was derived by the same method as the above-mentioned calculation method for the mutual diffusion coefficient D.sub.Na except that the molten salt to be used was changed to 100 KNO.sub.3 and the target of the EPMA measurement was changed to a K ion.

TABLE-US-00042 TABLE 42 Example number 6-1 6-2 6-3 6-4 6-5 Sample No. No. 055 No. 072 No. 116 No. 106 No. 247 Measurement Thickness (mm) 0.7 0.7 0.7 0.7 0.7 of Na ion Molten salt for 100% 100% 100% 100% 100% mutual tempering NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 NaNO.sub.3 diffusion Temperature of 380 380 380 380 380 coefficient molten salt ( C.) Tempering time 80 240 390 70 60 period t (min) DOC (m) 75 108 121 120 98 C_Na, max (mol %) 498 587 624 613 726 C_Na, min (mol %) 129 172 234 378 423 D.sub.Na (10.sup.13 m.sup.2/sec) 1.52 1.96 1.79 8.59 9.83 Measurement Thickness (mm) 0.7 0.7 0.7 0.7 0.7 of K ion Molten salt for 100% 100% 100% 100% 100% mutual tempering KNO.sub.3 KNO.sub.3 KNO.sub.3 KNO.sub.3 KNO.sub.3 diffusion Temperature of 380 380 380 380 380 coefficient molten salt ( C.) Tempering time 390 180 120 57 57 period (min) DOL (m) 4.8 5.2 4.5 6.7 6.6 C_K, max (mol %) 1,763 1,276 1,558 1,594 1,859 C_K, min (mol %) 15 16 16 73 179 D.sub.K (10.sup.16 m.sup.2/sec) 1.19 3.02 2.95 15.1 14.9 Mutual diffusion coefficient 0.0008 0.0015 0.0017 0.0018 0.0015 ratio D.sub.K/D.sub.Na

[0216] Further, an untempered glass sheet (glass sheet to be tempered) having the same composition as that of each of Samples No. 055, No. 072, No. 106, No. 116, and No. 247 of Example 1 and having a thickness of 0.7 mm was subjected to first ion exchange under the conditions shown in Table 43, and was then subjected to second ion exchange under the conditions shown in the same table. Thus, a tempered glass sheet was obtained.

TABLE-US-00043 TABLE 43 Example number 6-1 6-2 6-3 6-4 6-5 Sample No. No. 055 No. 072 No. 116 No. 106 No. 247 Thickness (mm) 0.7 0.7 0.7 0.7 0.7 First ion Molten salt for 0/100 0/100 0/100 0/100 0/100 exchange tempering (KNO.sub.3/NaNO.sub.3) Temperature of 380 380 380 380 380 molten salt ( C.) Tempering time 300 300 240 120 105 period (min) CS (MPa) 350 334 402 306 349 CS30.sub.1st (MPa) 231 224 267 196 225 DOC (m) 110 119 106 115 112 Second ion Molten salt for 100/0 97.5/2.5 100/0 92.5/7.5 92.5/7.5 exchange tempering (KNO.sub.3/NaNO.sub.3) Temperature of 430 380 380 410 410 molten salt ( C.) Tempering time 75 180 120 24 25 period (min) CS (MPa) 1,031 725 950 892 908 De (m) 5.0 5.0 5.0 5.5 5.8 DOC (m) 142 136 127 127 120 CT(MPa) 90.0 88 84.0 95.0 88.0 CS30.sub.2nd (MPa) 125 143 164 146 164 CS30.sub.Droprate 0.46 0.36 0.39 0.26 0.27 SPP-4PB (MPa) 176 189 204 206 199

[0217] Each of the resultant samples (Examples 6-1 to 6-5) was measured for the compressive stress values and the value of the depth of compression, and was then measured for the abraded four-point bending strength by the same methods as in Examples 2 to 5.

[0218] As apparent from Table 42 and Table 43, each of the tempered glass sheets of Examples 6-1 to 6-5 had a mutual diffusion coefficient ratio D.sub.K/D.sub.Na of 0.0008 or more and a compressive stress drop rate (CS30.sub.Droprate) of 0.46 or less, and after the two-step ion exchange, had a compressive stress value (CS) of the compressive stress layer on the outermost surface and a compressive stress value (CS30) thereof at a depth of 30 m from the outermost surface as high as 725 MPa or more and 125 MPa or more, respectively. In addition, the abraded four-point bending strength is as high as 176 MPa or more, and hence it is conceived that each of the tempered glass sheets is less liable to be broken at the time of dropping.

INDUSTRIAL APPLICABILITY

[0219] The tempered glass sheet of the present invention is suitable as a cover glass for a touch panel display of a cellular phone, a digital camera, a personal digital assistant (PDA), or the like. In addition, the tempered glass sheet of the present invention is expected to find applications for which high mechanical strength is required, for example, a window glass, a substrate for a magnetic disk, a substrate for a flat panel display, a substrate for a flexible display, a cover glass for a solar cell, a cover glass for a solid state image sensor, and a cover glass for an automobile, in addition to the above-mentioned applications.

REFERENCE SIGNS LIST

[0220] a first peak [0221] b first bottom [0222] c second peak [0223] d second bottom [0224] e inflection point

REINFORCED GLASS PLATE, METHOD FOR MANUFACTURING REINFORCED GLASS PLATE, AND GLASS PLATE TO BE REINFORCED

Inventors

Cpc classification

Classification Explorer

C03C2201/54

CHEMISTRY; METALLURGY

Classification Explorer

C03C3/091

CHEMISTRY; METALLURGY

Classification Explorer

C03C21/002

CHEMISTRY; METALLURGY

International classification

Classification Explorer

C03C3/091

CHEMISTRY; METALLURGY

Classification Explorer

C03C21/00

CHEMISTRY; METALLURGY

Abstract

Claims

Description