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Refractive Index |
nF (486nm) = 1.4631; nd (588nm) = 1.4585; nC (656nm) = 1.4564 |
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Reflection Loss |
for two surfaces
at 200nm - 9.1%; at 588nm - 6.8%; |
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Birefringence Constant |
3.54 nm/cm |
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Abbe Constant |
67.8 |
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Bubbles/Inclusions |
none |
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Fluorescence |
Virtually fluorescence free |
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Impurity Content |
Total metallic impurities: approximately 5 ppm |
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OH- Content |
> 1000 ppm |
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Density |
2.201 g/cm3 |
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Specific Heat Capacity |
703 J Kg-1K-1 |
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Thermal Conductivity |
1.38 Wm-1K-1 |
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Coefficient of Expansion |
0.55 x 10-6 /oC |
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Softening Point |
1600oC (2912oF) |
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Annealing Point |
1120oC (2048oF) |
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Strain Point |
1025oC (1877oF) |
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Max. Service Temperature |
950oC (1742oF) - continuous
1200oC (2192oF) - limited time |
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Dielectric Constant |
3.91 at 1kHz |
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Dielectric Strength |
250-400 kV/cm at 20oC |
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Young's Modulus |
73 GPa at 25oC |
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Shear Modulus |
31 GPa at 25oC |
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Rupture Modulus |
50 MPa at 25oC |
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Bulk Modulus |
36.9 GPa at 25oC |
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Apparent Elastic Limit |
55MPa (7980 psi) |
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Compressive Strength |
1.1 GPa |
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Tensile Strength |
50 MPa |
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Poisson Ratio |
0.17 at 25oC |
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Knoop Hardness |
500 kg/mm2 |
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Molecular Weight |
28.09 |
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Class/Structure |
Amorphous glass |
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Chemical Stability |
High resistance to water and acids (except hydrofluoric). |
