Provided is a composition for a glass fiber which has a high elastic modulus and satisfactory productivity, and can facilitate the production of a fine-count glass fiber. The composition for a glass fiber of the present invention includes, as a glass composition expressed as a mass percent in terms of oxide, 50% to 70% of SiO.sub.2, 15% to 25% of Al.sub.2O.sub.3, 3% to 13% of MgO, 3% to 15% of CaO, and 0.5% to 5% of B.sub.2O.sub.3.

Provided is a glass fiber-reinforced resin molded article including low dielectric constant and particularly low dielectric loss tangent, in a high-frequency region of 10 GHz or more. The glass fiber-reinforced resin molded article contains glass fiber in the range of 10 to 90% by mass and a resin in the range of 90 to 10% by mass with respect to the. total amount of the glass fiber-reinforced resin molded article. The glass fiber includes a composition including 52.0 to 59.5% by mass of SiO.sub.2, 17.5 to 25.5% by mass of B.sub.2O.sub.3, 9.0 to 14.0% by mass of Al.sub.2O.sub.3, 0.5 to 6.0% by mass of SrO, 1.0 to 5.0% by mass of MgO, 1.0 to 5.0% by mass of CaO, and 0.1 to 2.5% by mass of F.sub.2 and Cl.sub.2 with respect to the total amount of the glass fiber, and a number average fiber length is 1 to 10000 μm.

Provided is a glass fiber-reinforced resin molded article including low dielectric constant and particularly low dielectric loss tangent, in a high-frequency region of 10 GHz or more. The glass fiber-reinforced resin molded article contains glass fiber in the range of 10 to 90% by mass and a resin in the range of 90 to 10% by mass with respect to the. total amount of the glass fiber-reinforced resin molded article. The glass fiber includes a composition including 52.0 to 59.5% by mass of SiO.sub.2, 17.5 to 25.5% by mass of B.sub.2O.sub.3, 9.0 to 14.0% by mass of Al.sub.2O.sub.3, 0.5 to 6.0% by mass of SrO, 1.0 to 5.0% by mass of MgO, 1.0 to 5.0% by mass of CaO, and 0.1 to 2.5% by mass of F.sub.2 and Cl.sub.2 with respect to the total amount of the glass fiber, and a number average fiber length is 1 to 10000 μm.

The present invention provides a biological glass fiber for regenerative medical materials, comprising a biological glass or a biologically-inert glass made of a glass chemical composition. The glass chemical composition comprises in weight percentage, 5 to 25 wt% Na.sub.2O, 45 to 67 wt% SiO.sub.2, 15 to 25 wt% CaO, 2 to 6 wt% P.sub.2O.sub.5, 1 to 8 wt% MgO, 8 to 12.5 wt% K.sub.2O, 0.1 to 5 wt% total combined of non-toxic elements found in Group 5 and non-toxic elements found in Transition Metal Groups 3B, 4B and 5B, based on 100 wt% of the glass chemical composition; wherein the biological glass fiber forms a fiber configuration. The biological glass fiber is a soluble, resorbable, light transmittable and controllable absorption time regenerative material, and the biological glass fiber can mediate: therapeutic lymphangiogenesis, stem cell regeneration, bone cell regeneration and neurovascular regeneration, or it can be used as a cell carrier.

The present invention provides a biological glass fiber for regenerative medical materials, comprising a biological glass or a biologically-inert glass made of a glass chemical composition. The glass chemical composition comprises in weight percentage, 5 to 25 wt% Na.sub.2O, 45 to 67 wt% SiO.sub.2, 15 to 25 wt% CaO, 2 to 6 wt% P.sub.2O.sub.5, 1 to 8 wt% MgO, 8 to 12.5 wt% K.sub.2O, 0.1 to 5 wt% total combined of non-toxic elements found in Group 5 and non-toxic elements found in Transition Metal Groups 3B, 4B and 5B, based on 100 wt% of the glass chemical composition; wherein the biological glass fiber forms a fiber configuration. The biological glass fiber is a soluble, resorbable, light transmittable and controllable absorption time regenerative material, and the biological glass fiber can mediate: therapeutic lymphangiogenesis, stem cell regeneration, bone cell regeneration and neurovascular regeneration, or it can be used as a cell carrier.

According to various embodiments, a composition for preparing glass fibers comprises from about 58 wt. % to about 69 wt. % SiO.sub.2, from about 8 wt. % to about 15 wt. % RO, wherein RO is a total amount of MgO and CaO, from about 12 wt. % to about 18 wt. % R.sub.2O, wherein R.sub.2O is a total amount of Na.sub.2O and K.sub.2O, up to about 2 wt. % of a single oxidizing agent, and Fe.sub.2O.sub.3 and FeO. A ratio of Fe.sup.2+/Fe.sup.3+ is between 0.02 and 0.1. The glass composition has a log 3 viscosity of between about 911 ° C. and about 1173 ° C.

According to various embodiments, a composition for preparing glass fibers comprises from about 58 wt. % to about 69 wt. % SiO.sub.2, from about 8 wt. % to about 15 wt. % RO, wherein RO is a total amount of MgO and CaO, from about 12 wt. % to about 18 wt. % R.sub.2O, wherein R.sub.2O is a total amount of Na.sub.2O and K.sub.2O, up to about 2 wt. % of a single oxidizing agent, and Fe.sub.2O.sub.3 and FeO. A ratio of Fe.sup.2+/Fe.sup.3+ is between 0.02 and 0.1. The glass composition has a log 3 viscosity of between about 911 ° C. and about 1173 ° C.

Disclosed herein are glass-ceramic compositions, articles made from the disclosed glass-ceramic compositions, and methods of making the same. More specifically disclosed herein is a glass-ceramic composition comprising: a) from about 2 mol % to about 20 mol % of Al.sub.2O.sub.3; b) from about 2 mol % to about 45 mol % of Li.sub.2O; and c) from about 48 mol % to about 80 mol % of SiO.sub.2; having a β-spodumene phase and a lithium silicate crystalline phase, and optionally a petalite phase.

The present invention provides a glass composition not requiring a large quantity of rare earth material, producible by a common apparatus for producing a glass, having a high Young's modulus and a large crack initiation load, and suitable for glass fibers etc. A glass composition according to the present invention contains, in mol %: 50 to 65% SiO.sub.2; 7.5 to 26% Al.sub.2O.sub.3; 15 to 30% MgO; 0 to 8% CaO; 0 to 3% B.sub.2O.sub.3; 0 to 3% Li.sub.2O; and 0 to 0.2% Na.sub.2O. In this glass composition, a total content of MgO and CaO is in a range of 18 to 35 mol %, and a mol ratio calculated by Al.sub.2O.sub.3/(MgO+CaO) is less than 1.

The present invention provides a glass composition not requiring a large quantity of rare earth material, producible by a common apparatus for producing a glass, having a high Young's modulus and a large crack initiation load, and suitable for glass fibers etc. A glass composition according to the present invention contains, in mol %: 50 to 65% SiO.sub.2; 7.5 to 26% Al.sub.2O.sub.3; 15 to 30% MgO; 0 to 8% CaO; 0 to 3% B.sub.2O.sub.3; 0 to 3% Li.sub.2O; and 0 to 0.2% Na.sub.2O. In this glass composition, a total content of MgO and CaO is in a range of 18 to 35 mol %, and a mol ratio calculated by Al.sub.2O.sub.3/(MgO+CaO) is less than 1.