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Silica Glass (SiO2)

♦ Silica Glass (SiO2) Data Sheet   ♦ Silica Glass (SiO2) SDS    ♦ Silica Glass (SiO2) FDS (French)

Silica Glass (SiO2) Selection Guide

Fused Silica is a hard, high temperature pure glass. Fused Silica is used for UV and visible components. Infra-red grades of Fused Silica are available for NIR use

 

Transmission Range : 0.18 to 2.2 μm (3 μm for IR grades)
Refractive Index : 1.47012 at 4 μm (1)
Reflection Loss : 7.0% at 0.4 μm (2 surfaces)
Absorption Coefficient : 10 x 10-6 cm-1 at 1 μm
Reststrahlen Peak : n/a
dn/dT : +12.9 x 10-6 /°C (2)
dn/dμ = 0 : 1.3 μm
Density : 2.203 g/cc
Melting Point : 1600 °C (softening)
Thermal Conductivity : 1.38 W m-1 K-1
Thermal Expansion : 0.55 x 10-6 /°C at 300K
Hardness : Knoop 500 with 200g indenter
Specific Heat Capacity : 703 J Kg-1 K-1
Dielectric Constant : 3.78 at 25GHz
Youngs Modulus (E) : 73.1 GPa
Shear Modulus (G) : 31.2 GPa
Bulk Modulus (K) : 36.7 GPa
Elastic Coefficients : n/a
Apparent Elastic Limit : 55 MPa (7980 psi)
Poisson Ratio : 0.17
Solubility : Insoluble in Water
Molecular Weight : 28.09
Class/Structure : Amorphous glass

 

To download this data as a pdf file, or to download our MSDS safety data sheet, please click on the links at the top of the page.  To expand the transmission graphs, please click on the image.

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µm   Noµm   Noµm   No
0.20    1.55051 0.25    1.50745 0.30    1.48779
0.36    1.47529 0.40    1.47012 0.45    1.46557
0.50    1.46233 0.55    1.46008 0.60    1.45804
0.65    1.45653 0.70    1.45529 0.75    1.45424
0.8    1.45332 0.85    1.4525 0.90    1.45175
1.0    1.45042 1.1    1.4492 1.2    1.44805
1.3    1.44692 1.5    1.44462 1.6    1.44342
1.7    1.44217 1.8    1.44087 1.9    1.43951
2.0    1.43809 2.2    1.43501 2.4    1.43163
2.6    1.42789 2.8    1.42377 3.0    1.41925
3.2    1.41427 3.37    1.41099

Fused Silica is the glassy form of Quartz and is thus isotropic. Fused Silica is tough and hard and has a very low expansion. Normal varieties of Fused Silica contain water which gives strong absortion in the IR. Water-free varieties of Fused Silica are available.
REFERENCES:
(1) Handbook Optical Constants, ed Palik, V1, ISBN 0-12-544420-6