Fused
Silical
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| Fused Silica offers the
same thermal, physical and mechanical properties which are typical of
all fused silica, including being colorless and having excellent transmission
in the UV. This material is ideal for optical reference flats, test
plates, structural members and high temperature view ports where fused
silica properties such as low CTE are desired. It is available in substrate
and optical (higher homogeneity) grades. |
Applications: |
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| Fused silica
can be used where resistance to radiation darkening is required, such
as in space or as longterm passive energy collectors. Flatness, parallelism,
cutting tolerances, roughness, cosmetic defects and visual inspection
all conform to the specifications to be agreed upon by Precision Glass
& Optics and the customer. |
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| PROPERTIES |
Refractive Index |
nd= 1.45840 at 589.3 nm |
| MECHANICAL
AND THERMAL |
Density |
2.20g/cm3 |
| Youngs modulus (E) |
7.24 GPa @ 25 |
| Thermal Coefficient of Expansion |
(0-200) = 5.7 x 10-7/ |
| Melting point |
2040 |
| Thermal Conductivity (25) |
1.38 W/m |
| Specific Heat (25) |
0.177 cal/gm |
| Thermal Diffusivity (25) |
7.5 x 10-3 cm2/sec. |
ELECTRICAL |
Log10 Volume Resistivity @250 |
11.8 ohm-cm |
| Dielectric Constant (20, 1 MHz) |
3.80 |
| Loss tangent (20, 1 MHz) |
0.0010% |
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rights reserved.
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