Material Fused Silica (KV)
Full Spectrum Grade Synthetic Fused Silica (KV)
Fused silica is the glassy form of quartz and is thus isotropic. It is tough and hard and has a very low expansion. Normal varieties contain water which gives strong absorption in the IR. Water-free varieties are available.
BASE PROPERTIES
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PARAMETER |
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VALUE |
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| OPTICAL |
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| |
Refractive Index |
|
nF (486nm) = 1.4632; nd (588nm) = 1.4586; nC (656nm) = 1.4565 |
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| |
Birefringence Constant |
|
3.61 nm·kg/cm3 |
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| |
Index of Absorption |
|
10 x 10-6 cm-1 at 1 microns |
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| |
Refliction Loss |
|
7.0% (L=400 nm, for two surfaces ) |
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| |
dn/dT |
|
11.9 х 10-6/К |
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| |
dn/dm = 0 |
|
1.3 µm |
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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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| PHYSYCAL |
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| |
Density |
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2.203 g/cm3 |
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Thermal Conductivity |
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1.38 Wm-1K-1 |
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| |
Specific Heat Capacity |
|
703 J Kg-1K-1 |
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| |
Dielectric Constant |
|
3.91 |
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| |
Softening Point |
|
1730° C |
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Strain Point |
|
1075° C |
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| |
Annealing Point |
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1180° C |
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| |
Max. Service Temperature |
|
1150° C (continuous)
1300° C (limited time) |
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| |
Coefficient of Expansion |
|
0.55 x 10-6/К |
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| |
Knoop Hardness |
|
500 kg/mm2 |
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Young's Modulus |
|
73 GPa at 25° C |
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Shear Modulus |
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31 GPa at 25° C |
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| |
Bulk Modulus |
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36.9 GPa at 25° C |
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| |
Poisson Ratio |
|
0.17 at 25° C |
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| |
Rupture Modulus |
|
50 MPa at 25° C |
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| |
Tensile Strength |
|
50 MPa |
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| |
Compressive Strength |
|
1.1 GPa |
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| |
Apparent Elastic Limit |
|
55 MPa |
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| |
Dielectric Strength |
|
250-400 kV/cm at 20° C |
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| CHEMICAL |
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| |
Molecular Weight |
|
28.09 |
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| |
Class/Structure |
|
Amorphous glass |
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| |
Chemical Stability |
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High resistance to water and acids (except hydrofluoric). |
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| |
Impurity Content |
|
Total metallic impurities: 25 - 30 ppm |
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| |
ОН- Content |
|
400 - 500 ppm |
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REFRACTIVE INDEX
| |
Wavelength, µm |
0.2 |
0.22 |
0.25 |
0.3 |
0.32 |
0.36 |
0.4 |
0.45 |
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|
|
Refractive Index |
1.551 |
1.528 |
1.507 |
1.488 |
1.483 |
1.475 |
1.470 |
1.466 |
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Wavelength, µm |
0.5 |
0.55 |
0.59 |
0.60 |
0.65 |
0.7 |
0.75 |
0.8 |
0.85 |
|
|
Refractive Index |
1.462 |
1.460 |
1.458 |
1.458 |
1.457 |
1.455 |
1.454 |
1.453 |
1.452 |
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Wavelength, µm |
0.9 |
1.0 |
1.1 |
1.2 |
1.3 |
1.5 |
1.6 |
1.7 |
1.8 |
|
|
Refractive Index |
1.452 |
1.450 |
1.450 |
1.448 |
1.447 |
1.445 |
1.443 |
1.442 |
1.441 |
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Wavelength, µm |
1.9 |
2.0 |
2.2 |
2.4 |
2.6 |
2.8 |
3.0 |
3.2 |
3.37 |
|
|
Refractive Index |
1.440 |
1.438 |
1.435 |
1.431 |
1.428 |
1.424 |
1.419 |
1.414 |
1.410 |
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