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 |