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Refractive Index |
nF (486nm) = 1.4632; nd (588nm) = 1.4586; nC (656nm) = 1.4565 |
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for two surfaces
at 400nm – 7.0%; at 588nm – 6.8%; | |
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Index of Absorption |
10 x 10-6 cm-1 at 1 microns |
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dN/dT |
+11.9 X 10-6/°C |
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dN/dµ = 0 |
1.3µm |
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Birefringence Constant |
3.61 nm/cm |
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Abbe Constant |
67.6 |
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Fluorescence |
Upon excitation at 242 nm the material displays blue fluorescence. |
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Impurity Content |
Total metallic impurities: 25 - 30 ppm |
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OH- Content |
400 - 500 ppm |
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Density |
2.203 g/cm3 |
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Thermal Conductivity |
1.38 Wm-1K-1 |
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Specific Heat Capacity |
703 J Kg-1K-1 |
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Coefficient of Expansion |
0.55 x 10-6 /oC |
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Softening Point |
1730oC (3146oF) |
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Annealing Point |
1180oC (2156oF) |
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Strain Point |
1075oC (1967oF) |
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Max. Service Temperature |
1150oC (2102oF) - continuous, 1300oC (2372oF) - 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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Poisson Ratio |
0.17 at 25oC |
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Knoop Hardness |
500 kg/mm2 |
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Compressive Strength |
1.1 GPa |
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Tensile Strength |
50 MPa |
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Apparent Elastic Limit |
55MPa (7980 psi) |
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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). |
