Thermal, Physical, Mechanical, and Optical Properties and Associated Test Methods of a Few Alkali Borosilicate Glasses and the Alkali Aluminosilicate Glass
| units | TEST METHOD | Type 1B | Type 1A | Aluminosilicate | |||
|---|---|---|---|---|---|---|---|
| Borosilicate A | Borosilicate B | Borosilicate C | Borosilicate H | ||||
| Strain Point (1014.5 P) | °C | ASTM C336-71/2010 | 525 | 530 | 537 | 525 | 556 |
| Anneal Point (1013 P) | °C | ASTM C336-71/2010 | 560 | 565 | 576 | 560 | 608 |
| Softening Point (107.6 P) | °C | ASTM C338-93/2008 | 780 | 785 | 767 | 825 | 870 |
| Working Point (104 P) | °C | ASTM C965-96/2012 | 1164 | 1160 | 1260 | 1292 | |
| (0–300°C) Thermal Expansion | 10−7 K−1 | ASTM E228-11 | 52 | 49 | 53 | 33 | 69 |
| Density | g/cm3 | ASTM C693-93/2008 | 2.34 | 2.34 | 2.41 | 2.23 | 2.39 |
| Refractive Index | @ 589nm | various methods | 1.49 | 1.492 | 1.473 | 1.493 | |
| Stress-Optic Coefficient | 10−6 mm2.N−1 | ASTM C770-98/2008 | 3.4 | 4.0 | 3.05 | ||
| Young's modulus | GPa | ASTM C623-92/2010 | 73 | 63 | 71 | ||
| Poisson's ratio | - | ASTM C623-92/2010 | 0.2 | 0.2 | 0.2 | ||