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What are the properties of Borosilicate Glass?
What are the properties of Borosilicate Glass?
| Metric | US | |
| Coefficient of mean linear thermal | 3.3 · 10-6 K-1 | 3.3 · 10-6 K-1 |
| expansion a acc. to DIN ISO 7991 | (20 °C; 300 °C) | (68 °F; 572 °F) |
| Transformation temperature Tg | 525 °C | 977 °F |
| Density r at 25 °C | 2.23 g · cm-3 | 139.2 lb · ft-3 |
| Modulus of elasticity E (Young’s modulus) | 63 · 103 N · mm-2 | 91 · 105 lb · in-2 (psi) |
| Poisson’s ratio m | 0.20 | 0.20 |
| Thermal conductivity lw at 90 °C | 1.2 W · m-1 · K-1 | 0.69 Btu · hr -1 · ft-1 · °F-1 |
| Refractive index (l = 587.6 nm) nd | 1.473 | 1.473 |
| Stress-optical coefficient (DIN 52 314) K | 4.0 · 10-6 mm2 · N -1 | 4.0 · 10-6 mm2 · N-1 |
| Chemical Composition | |||
| SiO2 | B2O3 | Na2O +K2O | Al2O3 |
| 81 | 13 | 4 | 2 |
| Chemical Resistance | |
| Hydrolytic Class (DIN ISO 719) | HGB 1 |
| Acid Class (DIN 12116) | Class S 1 |
| Alkali Class (DIN ISO 695) | Class A 2 |
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