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KI
INFRARED GRADE FUSED QUARTZ
Transmittance (10 mm thickness,
reflective losses included)
| Refractive Index |
nf
(486nm) = 1.4632; nd
(588nm) = 1.4585; nc
(656nm) = 1.4564 |
| Birefringence Constant |
3.61 (nm/cm)/(kg/cm2) |
| Abbe Constant |
67.8 |
| Fluorescence |
Violet-blue upon excitation at 248 nm |
| Impurity Content |
Total metallic impurities: less than 15 ppm |
| OH- Content |
< 0.2 ppm |
| Density |
2.201 g/cm3 |
| Coefficient of Expansion |
0.55 x 10-6 /oC |
| Softening Point |
1730oC (3145oF) |
| Annealing Point |
1180oC (2155oF) |
| Strain Point |
1075oC (1965oF) |
| Max. Service Temperature |
1150oC (2100oF)
-continuous, 1300oC (2370oF) -limited time |
| Dielectric Strength |
250-400 kV/cm at 20oC |
| Chemical Stability |
High resistance to water and acids (except
hydrofluoric). |
| Young's Modulus |
73 GPa at 25oC |
| Shear Modulus |
31 GPa at 25oC |
| Rupture Modulus |
50 MPa at 25oC |
| Bulk Modulus |
36.9 GPa at 25oC |
| Poisson Ratio |
0.17 at 25oC |
| Knoop Hardness |
500 kg/mm2 |
| Compressive Strength |
1.1 GPa |
| Tensile Strength |
50 MPa |
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