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 |
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Refractive Index |
nd = 1.51680; ne = 1.51872 |
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Reflection Loss |
8.3% at 588nm (2 surfaces) |
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Abbe Constant |
nd = 64.17; ne = 63.96 |
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Principal Dispersion |
nF – nC = 0.008054
nF' - nC' = 0.008110 |
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Density |
2.51 g/cm3 |
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Thermal Conductivity |
1.114 W/(m*K) |
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Specific Heat Capacity |
0.858 J/(g*K) |
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Coefficient of Expansion |
a (-30/+70°C) = 7.1? 10-6/K
a (20/300°C) = 8.3? 10-6/K |
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Transformation Temperature, Tg |
557°C |
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Temperature of the glass at a viscosity of 1013 dPa? s |
557°C |
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Temperature of glass in at a viscosity of 107.6 dPa s |
719°C |
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Elasticity Modulus |
82 x 103 N/mm² |
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Poisson's Ratio |
0.206 |
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Stress optical coefficient |
2.77 x 10-6 mm²/N |
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Knoop hardness (0.1/20) |
610 |
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Bubble class |
0 |
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Climatic resistance |
2 |
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Stain resistance |
0 |
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Acid resistance |
1 |
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Alkali resistance |
2.0 |
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Phosphate resistance |
2.3 |
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Melting Frequency |
I |
