OPTICAL COMPONENT AND GLASS COMPOSITION AS WELL AS USE THEREOF

Abstract

A glass includes: a plurality of components (in wt.-%) as follows:

TABLE-US-00001 Component Proportion (% by weight) SiO.sub.2 50-80  Al.sub.2O.sub.3 0-10 B.sub.2O.sub.3 0-15 Li.sub.2O 0-20 Na.sub.2O 0-20 K.sub.2O 0-25 BaO 0-10 CaO 0-10 MgO 0-10 ZnO 0-10 La.sub.2O.sub.3 0-20 TiO.sub.2 0-5  Cl 0-3  MnO.sub.2 0.2-5.0  Cr.sub.2O.sub.3 0.05-3.0,.sup. 
a sum of a plurality of proportions of Li.sub.2O, Na.sub.2O and K.sub.2O being in a range of from 5.0 to 30.0 wt.-%, a sum of a plurality of amounts of MnO.sub.2 and Cr.sub.2O.sub.3 being at least 0.3 wt.-%, and a ratio of a plurality of proportions of MnO.sub.2 (in wt.-%) and Cr.sub.2O.sub.3 (in wt.-%) being in a range of from 1.5:1 to 12.5:1.

Claims

1. A glass, comprising: a plurality of components (in wt.-%) as follows: TABLE-US-00028 Component Proportion (% by weight) SiO.sub.2 50-80  Al.sub.2O.sub.3 0-10 B.sub.2O.sub.3 0-15 Li.sub.2O 0-20 Na.sub.2O 0-20 K.sub.2O 0-25 BaO 0-10 CaO 0-10 MgO 0-10 ZnO 0-10 La.sub.2O.sub.3 0-20 TiO.sub.2 0-5  Cl 0-3  MnO.sub.2 0.2-5.0  Cr.sub.2O.sub.3 0.05-3.0,.sup.  a sum of a plurality of proportions of Li.sub.2O, Na.sub.2O and K.sub.2O being in a range of from 5.0 to 30.0 wt.-%, a sum of a plurality of amounts of MnO.sub.2 and Cr.sub.2O.sub.3 being at least 0.3 wt.-%, and a ratio of a plurality of proportions of MnO.sub.2 (in wt.-%) and Cr.sub.2O.sub.3 (in wt.-%) being in a range of from 1.5:1 to 12.5:1.

2. The glass according to claim 1, wherein at least one of: (a) an amount of Cr.sub.2O.sub.3 is in a range of from 0.1 to 2.5 wt.-%; and (b) an amount of MnO.sub.2 is in a range of from 0.3 to 4.5 wt.-%.

3. The glass according to claim 2, wherein at least one of: (a) the amount of Cr.sub.2O.sub.3 is in a range of from 0.15 to 2.0 wt.-%; and (b) the amount of MnO.sub.2 is in a range of from 0.5 to 4.0 wt.-%.

4. The glass according to claim 1, wherein at least one of: (a) an amount of Cr.sub.2O.sub.3 is in a range of from 0.2 to 3.0 wt.-%; (b) an amount of MnO.sub.2 is in a range of from 1.0 to 5.0 wt.-%; and (c) the sum of the plurality amounts of MnO.sub.2 and Cr.sub.2O.sub.3 is at least 2.7 wt.-%.

5. The glass according to claim 4, wherein at least one of: (a) an amount of Cr.sub.2O.sub.3 is in a range of from 0.5 to 2.5 wt.-%; (b) an amount of MnO.sub.2 is in a range of from 1.5 to 4.5 wt.-%; and (c) the sum of the plurality amounts of MnO.sub.2 and Cr.sub.2O.sub.3 is at least 2.7 wt.-%.

6. The glass according to claim 1, wherein an amount of Cl is at least 0.1 wt.-%.

7. The glass according to claim 1, wherein the glass at a sample thickness of 2 mm has at least one of: (a) an average transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 0.01%; (b) a maximum transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 5.0%; (c) an average internal transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 0.1%; and (d) a maximum internal transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 5.0%.

8. The glass according to claim 1, wherein the glass at a sample thickness of 2 mm has at least one of: (a) at least one of an average transmittance and a minimum transmittance for light of a wavelength in a range of from 1250 nm to 1350 nm of at least 50%; and (b) at least one of an average internal transmittance and a minimum internal transmittance for light of a wavelength in a range of from 1250 nm to 1350 nm of at least 50%.

9. The glass according to claim 1, wherein the glass at a sample thickness of 2 mm has at least one of: (a) at least one of an average transmittance and a minimum transmittance for light of a wavelength in a range of from 1500 nm to 1600 nm of at least 50%; and (b) at least one of an average internal transmittance and a minimum internal transmittance for light of a wavelength in a range of from 1500 nm to 1600 nm of at least 50%.

10. The glass according to claim 1, wherein the glass at a sample thickness of 4 mm has at least one of: (a) an average transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 10%; (b) a maximum transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 15.0%; (c) an average internal transmittance for light of a wavelength in a range of from 250 nm to 700 nm of at most 10%; and (d) a maximum internal transmittance for light of a wavelength in a range from 250 nm to 700 nm of at most 15%.

11. The glass according to claim 1, wherein the glass at a sample thickness of 2 mm has an internal transmittance at a wavelength of 1550 nm of at least 94.0%.

12. The glass according to claim 1, wherein the glass has at least one of: (a) a hydrolytic resistance according to class 1 of DIN ISO 719:2020-09; (b) a hydrolytic resistance according to class 1 of DIN ISO 720:1989-12; (c) an alkaline resistance according to class 2 of DIN ISO 695:1994-02; and (d) an acid resistance according to class 1 of DIN 12116:2001-03.

13. The glass according to claim 1, wherein the glass has at least one of: (a) a hydrolytic resistance according to class 1 of DIN ISO 719:2020-09; (b) a hydrolytic resistance according to class 1 of DIN ISO 720:1989-12; (c) an alkaline resistance according to class 1 of DIN ISO 695:1994-02; and (d) an acid resistance according to class 1 of DIN 12116:2001-03.

14. A glass article, comprising: a glass including a plurality of components (in wt.-%) as follows: TABLE-US-00029 Component Proportion (% by weight) SiO.sub.2 50-80  Al.sub.2O.sub.3 0-10 B.sub.2O.sub.3 0-15 Li.sub.2O 0-20 Na.sub.2O 0-20 K.sub.2O 0-25 BaO 0-10 CaO 0-10 MgO 0-10 ZnO 0-10 La.sub.2O.sub.3 0-20 TiO.sub.2 0-5  Cl 0-3  MnO.sub.2 0.2-5.0  Cr.sub.2O.sub.3 0.05-3.0,.sup.  a sum of a plurality of proportions of Li.sub.2O, Na.sub.2O and K.sub.2O being in a range of from 5.0 to 30.0 wt.-%, a sum of a plurality of amounts of MnO.sub.2 and Cr.sub.2O.sub.3 being at least 0.3 wt.-%, and a ratio of a plurality of proportions of MnO.sub.2 (in wt.-%) and Cr.sub.2O.sub.3 (in wt.-%) being in a range of from 1.5:1 to 12.5:1, the glass article having a thickness in a range of from 1.0 mm to 7.0 mm.

15. The glass article according to claim 14, wherein the glass article fulfills at least one of the following conditions: i) ΔT.sub.Sol (905 nm)=T(905 nm)|.sub.initial−T(905 nm)|.sub.irradiated wherein ΔT.sub.Sol is less than 5%; ii) ΔT.sub.Sol(1320 nm)=T(1320 nm)|.sub.initial−T(1320 nm)|.sub.irradiated wherein ΔT.sub.Sol is less than 5%; and iii) ΔT.sub.Sol (1550 nm)=T(1550 nm)|.sub.initial−T(1550 nm)|.sub.irradiated wherein ΔT.sub.Sol is less than 5%; wherein T(λ).sub.initial is a transmission at a wavelength λ of a sample having a sample thickness of 4 mm prior to an irradiation, T(λ).sub.irradiated is a transmission at a wavelength λ of a sample having a sample thickness of 4 mm after an irradiation of 15 hours with a HOK 4 lamp, and ΔT.sub.Sol is a difference between T(λ).sub.initial and T(λ).sub.irradiated.

16. The glass article according to claim 14, wherein at least one of: (a) a sum of all cross-sections of all bubbles and inclusions ≥0.03 mm in diameter is at most 0.5 mm.sup.2 per 100 cm.sup.3 of a glass volume; (b) the glass article has a characteristic value of at most 1.30 per mm thickness of the glass article in a stone impact test according to method A of DIN EN ISO 20567-1:2017-07; and (c) the glass article has a total loss of weight of at most 150 mg per mm thickness of the glass article in a stone impact test according to method A of DIN EN ISO 20567-1:2017-07.

17. The glass article according to claim 14, wherein at least one of: (a) a sum of all cross-sections of all bubbles and inclusions ≥0.03 mm in diameter is at most 0.25 mm.sup.2 per 100 cm.sup.3 of a glass volume; (b) the glass article has a characteristic value of at most 1.30 per mm thickness of the glass article in a stone impact test according to method A of DIN EN ISO 20567-1:2017-07; and (c) the glass article has a total loss of weight of at most 150 mg per mm thickness of the glass article in a stone impact test according to method A of DIN EN ISO 20567-1:2017-07.

18. The glass article according to claim 14, wherein the glass article is formed at least in part by an optical window, which forms in part a LiDAR system including a laser and the optical window positioned between the laser and a surrounding.

19. A method for producing a glass, the method comprising the steps of: providing that the glass includes a plurality of components (in wt.-%) as follows: TABLE-US-00030 Component Proportion (% by weight) SiO.sub.2 50-80  Al.sub.2O.sub.3 0-10 B.sub.2O.sub.3 0-15 Li.sub.2O 0-20 Na.sub.2O 0-20 K.sub.2O 0-25 BaO 0-10 CaO 0-10 MgO 0-10 ZnO 0-10 La.sub.2O.sub.3 0-20 TiO.sub.2 0-5  Cl 0-3  MnO.sub.2 0.2-5.0  Cr.sub.2O.sub.3 0.05-3.0,.sup.  a sum of a plurality of proportions of Li.sub.2O, Na.sub.2O and K.sub.2O being in a range of from 5.0 to 30.0 wt.-%, a sum of a plurality of amounts of MnO.sub.2 and Cr.sub.2O.sub.3 being at least 0.3 wt.-%, and a ratio of a plurality of proportions of MnO.sub.2 (in wt.-%) and Cr.sub.2O.sub.3 (in wt.-%) being in a range of from 1.5:1 to 12.5:1; melting a plurality of raw materials of the glass; and cooling the glass obtained.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0151] The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawing, wherein:

[0152] FIG. 1 shows the transmittance of example glasses E4, E7 and E9 in the wavelength range from 250 to 1750 nm for a sample thickness of 2 mm;

[0153] FIG. 2 shows the transmittance of example glasses E4, E7 and E9 in the wavelength range from 250 to 1750 nm for a sample thickness of 4 mm;

[0154] FIG. 3 shows the emission spectrum of the HOK 4/120 lamp from Phillips, on the x-axis the wavelength in nm being shown, on the y-axis the relative intensity being shown; and

[0155] FIG. 4 shows the transmittance of example glasses E19 and E20 in the wavelength range from 900 nm to 1700 nm before and after an irradiation with a HOK 4/120 lamp from Phillips for 15 hours.

[0156] Corresponding reference characters indicate corresponding parts throughout the several views. The exemplification set out herein illustrate embodiments of the invention, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

Examples

[0157] The present invention is further described by the following examples.

[0158] Glass Compositions

[0159] The following table shows the synthesis compositions of example glasses E1 to E9 of the present invention in wt.-%.

TABLE-US-00014 E1 E2 E3 E4 E5 E6 E7 E8 E9 SiO.sub.2 63.0 68.8 61.2 59.8 62.6 68.0 69.0 69.0 68.0 Al.sub.2O.sub.3 B.sub.2O.sub.3 2.0 3.0 5.0 4.9 1.4 6.0 8.0 3.0 3.0 Li.sub.2O 1.0 Na.sub.2O 6.8 10.1 6.7 5.6 5.7 10.0 10.0 10.0 9.0 K.sub.2O 14.7 6.1 14.5 9.8 12.6 4.0 3.0 6.0 5.0 BaO 3.6 4.0 3.0 2.0 1.0 2.0 4.0 CaO MgO ZnO 2.8 2.8 2.8 2.5 2.9 3.0 2.0 3.5 3.0 La.sub.2O.sub.3 12.7 10.6 TiO.sub.2 2.0 2.0 Cl 0.5 0.5 0.5 0.5 0.5 Sb.sub.2O.sub.3 0.4 0.1 0.4 0.1 MnO.sub.2 3.2 3.2 3.1 3.1 2.7 3.2 3.2 3.2 3.2 Cr.sub.2O.sub.3 1.4 1.4 1.3 1.3 1.1 1.4 1.4 1.4 1.4 ΣR.sub.2O 21.5 16.2 21.2 15.4 18.3 14.0 13.0 16.0 15.0 Ratio 2.3 2.3 2.4 2.4 2.5 2.3 2.3 2.3 2.3 MnO.sub.2/ Cr.sub.2O.sub.3

[0160] The following table shows the synthesis compositions of example glasses E10 to E18 of the present invention in wt.-%.

TABLE-US-00015 E10 E11 E12 E13 E14 E15 E16 E17 E18 SiO.sub.2 68.0 71.0 68.0 68.0 71.0 72.0 74.0 68.0 71.0 Al.sub.2O.sub.3 6.0 2.0 6.0 4.0 3.0 6.0 B.sub.2O.sub.3 3.0 10.0 3.0 3.0 10.0 5.0 11.0 3.0 10.0 Li.sub.2O Na.sub.2O 9.0 8.0 11.0 12.0 8.0 8.0 8.0 12.0 8.0 K.sub.2O 6.0 1.0 4.0 5.0 1.0 4.0 5.0 1.0 BaO 2.0 4.0 4.0 4.0 3.0 2.0 4.0 4.0 CaO 1.0 8.0 1.0 5.0 3.0 1.0 MgO 3.0 4.0 ZnO 2.5 1.8 1.0 1.8 La.sub.2O.sub.3 TiO.sub.2 Cl 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Sb.sub.2O.sub.3 MnO.sub.2 3.2 3.7 3.7 3.1 3.4 2.9 2.9 2.7 2.9 Cr.sub.2O.sub.3 1.4 1.5 1.5 1.3 1.4 1.1 1.1 1.0 1.1 ΣR.sub.2O 15.0 9.0 15.0 15.0 18.0 13.0 19.0 15.0 18.0 Ratio 2.3 2.5 2.5 2.4 2.4 2.6 2.6 2.7 2.6 MnO.sub.2/ Cr.sub.2O.sub.3

[0161] The following table shows the synthesis compositions of example glasses E19 to E22 of the present invention in wt.-%.

TABLE-US-00016 E19 E20 E21 E22 SiO.sub.2 68.4 71.2 71.7 Al.sub.2O.sub.3 5.8 5.8 B.sub.2O.sub.3 9.6 3.1 3.2 9.7 Li.sub.2O Na.sub.2O 7.7 12.6 12.7 7.8 K.sub.2O 1.0 5.2 5.3 1.0 BaO 3.9 4.2 4.2 3.9 CaO 1.0 1.0 MgO ZnO 1.9 1.9 La.sub.2O.sub.3 TiO.sub.2 Cl 0.5 0.5 0.5 0.5 Sb.sub.2O.sub.3 MnO2 1.6 0.9 0.4 0.8 Cr.sub.2O.sub.3 0.7 0.4 0.2 0.3 ΣR.sub.2O 8.7 17.8 17.9 8.8 Ratio 2.3 2.3 2.0 2.7 MnO.sub.2/Cr.sub.2O.sub.3

[0162] Optical Properties

[0163] The transmittance properties of glasses of the present invention were tested. In the following, transmittance properties of examples E1, E4 and E6 to E10 having a thickness of 2 mm or 4 mm, respectively, are summarized.

[0164] The P.sub.d values of the respective glasses were as follows:

TABLE-US-00017 E1 E4 E6 E7 E8 E9 E10 P.sub.d value 0.921 0.921 0.918 0.919 0.921 0.921 0.921

[0165] It was found that the glasses have a low transmittance in the visible range and a high transmittance in the NIR range. Exemplary transmittance curves are shown in FIGS. 1 and 2. A detailed analysis of transmittance properties is shown in the following.

[0166] Maximum and Minimum Transmittance

[0167] The following tables show transmittance properties of the glasses of the present invention. In particular, the maximum transmittance (Max. Transmittance) in the wavelength range from 250 to 700 nm and the minimum transmittance (Min. Transmittance) in the wavelength ranges from 800 to 900 nm, from 1250 to 1350 nm, and from 1500 to 1600 nm are shown. The transmittance was measured for any wavelength in the indicated intervals in intervals of 1 nm and the maximum or minimum transmittance, respectively, was determined.

[0168] The following table summarizes the results for a thickness of 2 mm.

TABLE-US-00018 Max. Min. Min. Min. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E1 0.2% 0.7% 84.2% 87.9% E4 0.01% 4.3% 82.9% 87.3% E6 0.0003% 1.0% 83.9% 88.8% E7 0.002% 1.9% 84.1% 88.8% E8 0.04% 1.0% 84.9% 88.2% E9 0.001% 0.6% 85.0% 89.5% E10 0.02% 3.4% 85.8% 88.5%

[0169] For all example glasses, there is basically zero transmittance in the visible range. The transmittance in the wavelength range of from 800 to 900 nm is also very low. However, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0170] The following table summarizes the results for a thickness of 4 mm.

TABLE-US-00019 Max. Min. Min. Min. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E1 3*10.sup.−4% 0.01% 76.9% 83.8% E4 2*10.sup.−6% 0.2% 74.7% 82.7% E6 1*10.sup.−9% 0.01% 76.7% 85.9% E7 4*10.sup.−8% 0.04% 76.9% 85.8% E8 2*10.sup.−5% 0.01% 78.2% 84.4% E9 7*10.sup.−9% 0.003% 78.4% 86.9% E10 3*10.sup.−6% 0.1% 79.9% 85.0%

[0171] For all example glasses, there is basically zero transmittance in the visible range. The transmittance in the wavelength range of from 800 to 900 nm is also very low. However, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0172] The following table summarizes the results for a thickness of 2 mm.

TABLE-US-00020 Max. Min. Min. Min. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E19 2.3% 25.4% 88.2% 90.2% E20 3.4% 24.1% 90.2% 91.5% E21 24.7% 55.3% 91.6% 91.8% E22 25.0% 57.1% 91.2% 91.7%

[0173] For all example glasses, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm. Moreover, for example glasses E19 and E20, there is a low transmittance in the visible range

[0174] The following table summarizes the results for a thickness of 4 mm.

TABLE-US-00021 Max. Min. Min. Min. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E19 0.1% 7.0% 84.4% 88.4% E20 0.1% 6.3% 88.4% 90.8% E21 6.6% 33.2% 91.0% 91.6% E22 6.8% 35.4% 90.3% 91.2%

[0175] For all example glasses, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm. Moreover, for all example glasses, there is a low transmittance in the visible range.

[0176] Average Transmittance

[0177] The following tables show transmittance properties of the glasses of the present invention. In particular, the average transmittance (Avg. Transmittance) in the wavelength range from 250 to 700 nm, from 800 to 900 nm, from 1250 to 1350 nm, and from 1500 to 1600 nm is shown. The transmittance was measured for any wavelength in the indicated ranges in intervals of 1 nm and the average transmittance was calculated as the mean of all measured transmittance values within the respective range.

[0178] The following table summarizes the results for a thickness of 2 mm.

TABLE-US-00022 Avg. Avg. Avg. Avg. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E1 0.004% 8.5% 85.3% 88.3% E4 0.001% 17.3% 84.2% 87.8% E6 0.00001% 9.6% 85.3% 89.4% E7 0.0001% 12.3% 85.5% 89.6% E8 0.002% 9.4% 86.0% 88.8% E9 0.00003% 7.3% 86.5% 90.1% E10 0.001% 16.0% 86.7% 88.8%

[0179] For all example glasses, there is basically zero transmittance or less than 10% in the visible range. The transmittance in the wavelength range of from 800 to 900 nm is also very low. However, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0180] The following table summarizes the results for a thickness of 4 mm.

TABLE-US-00023 Avg. Avg. Avg. Avg. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E1 6*10.sup.−6% 1.3% 79.0% 84.7% E4 4*10.sup.−8% 4.1% 77.0% 83.7% E6 1*10.sup.−11%.sup.  1.6% 79.3% 87.0% E7 2*10.sup.−9% 2.3% 79.6% 87.5% E8 5*10.sup.−7% 1.5% 80.3% 85.6% E9 2*10.sup.−10%.sup.  1.0% 81.3% 88.2% E10 1*10.sup.−7% 3.6% 81.7% 85.6%

[0181] For all example glasses, there is basically zero transmittance or less than 2% in the visible range. The transmittance in the wavelength range of from 800 to 900 nm is also very low. However, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0182] The following table summarizes the results for a thickness of 2 mm.

TABLE-US-00024 Avg. Avg. Avg. Avg. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E19 2.5*10.sup.−3% 20.8% 85.7% 88.8% E20 3.5*10.sup.−3% 22.2% 89.2% 91.1% E21 .sup.   7.6% 68.8% 91.4% 91.8% E22 .sup.   8.5% 68.9% 91.0% 91.6%

[0183] For all example glasses, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0184] The following table summarizes the results for a thickness of 4 mm.

TABLE-US-00025 Avg. Avg. Avg. Avg. Transmit- Transmit- Transmit- Transmit- tance tance tance tance (250- (800- (1250- (1500- 700 nm) 900 nm) 1350 nm) 1600 nm) E19 3.3. 10.sup.−5%.sup.    20.8% 85.7% 88.8% E20 6.4 10.sup.−5%.sup.    22.2% 89.2% 91.1% E21 1.2% 52.0% 90.8% 91.5% E22 1.4% 51.9% 89.9% 91.1%

[0185] For all example glasses, there is a low transmittance or less than 2% in the visible range. However, there is high transmittance in the relevant wavelength ranges of from 1250 to 1350 nm and from 1500 to 1600 nm.

[0186] Solarization Properties

[0187] The transmittance of samples of example glasses E19 and E20 according to the present invention having a sample thickness of 4 mm was measured before (T.sub.initial) and after irradiation with a HOK 4 lamp for 15 hours each (T.sub.irridated). A HOK 4/120 lamp from Phillips was used. The spectrum of this HOK 4/120 lamp is shown in FIG. 3. The distance between the lamp and the sample was 7 cm. The power density was 25 mW/cm.sup.2. The sample size was 18 mm×4 mm. The composition of the glasses is shown in the tables above.

[0188] The following table summarizes the results for a sample thickness of 4 mm at a wavelength of 1320 nm and 1550 nm.

TABLE-US-00026 T(1320 T(1320 ΔT(1320 T(1550 T(1550 ΔT(1550 nm).sub.inital nm).sub.irridatiad nm).sub.sol nm).sub.initial nm).sub.irridiated nm).sub.sol E19 86.2% 85.1% 1.1% 88.8% 87.8% 1.0 E20 89.4% 89.1% 0.3 91.1% 90.8% 0.3

[0189] For the example glasses E19 and E20 the evaluated values for ΔT(1320 nm).sub.sol and ΔT(11550 nm).sub.sol are very low.

[0190] Mechanical Properties

[0191] Two glass articles were subjected to the stone impact test according to method A of DIN EN ISO 20567-1:2017-07. The sample thickness was 3.8 mm for each of the samples. The net sample size was 80×80 mm.sup.2 for each of the samples. Both glass articles passed the test. None of the glass articles was broken. Both glass articles achieved a characteristic value of 2.0 in the stone impact test according to method A of DIN EN ISO 20567-1:2017-07. The term “method A” refers to the test pressure being 1.0±0.1 bar. The characteristic value in the stone impact test was determined based on the damaged area of the sample according to DIN EN ISO 20567-1:2017-07. The test conditions and settings of the stone impact test are summarized in the following table.

TABLE-US-00027 Funding time/Gravel feed per 10 sec. ± 2 sec. cycle: Grit/Blasting material: Chilled iron grit as per DIN EN ISO 11124-2 Mass of grit: 2 × 500 g (0 + 20) Number of cycles: 2 Grit/Blasting material size: 3.55-5.00 mm according to DIN EN ISO 11125-2 and DIN EN ISO 565 Manufacturer of gravel/grit Eisenwerk Würth Test pressure: Method A: 1.0 ± 0.1 bar Method B: 2.0 ± 0.1 bar Impact angle: 54° Temperature: 22° C. ± 1° C. Humidity: 44% ± 2% Adhesive tape: Tesa 4657 Pre-conditioning: for min. 24 h at 23° C. and 50% RH Distance between granule 290 ± 1 mm acceleration tube and sample center:

[0192] All loose particles generated by the stone impact test were removed with adhesive tape and the total loss of weight was determined as the total weight of all particles removed with the adhesive tape. The total loss of weight in the stone impact test according to method A of DIN EN ISO 20567-1:2017-07 was 61.7 mg for the first glass article and 64.0 mg for the second glass article.

[0193] While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.