Fused Silica - Properties and Applications

Fused silica is made from high purity silica, using unique fusion technology, to ensure the highest quality. Our fused silica is over 99% amorphous and has an extremely low coefficient of thermal expansion and high resistance to thermal shock. Fused silica is inert, has excellent chemical stability, and has extremely low electrical conductivity.

Applications of Fused Silica

Fused silica is an excellent raw material for use in investment casting, refractories, foundries, technical ceramics, and other applications that require a consistent, high purity product with very low thermal expansion.

Typical Chemical Analysis of Fused Silica

Typical chemical analysis of fused silica is given in the following table.

Chemical Composition
SiO2 99.80%
Al2O3 0.05%
Fe2O3 0.015%
Na2O 0.007%
K2O 0.003%
TiO2 0.01%
CaO 0.01%
MgO 0.003%

Typical Physical Properties of Fused Silica

Typical physical properties of fused silica are described in the following table.

Physical Property Specification
Magnetics 0.004%
Specific Gravity 2.21%
pH 7.0 max.
Coefficient Thermal Expansion 0.5 x 10-6 / ºC
Bulk Density 65 - 75 lb. / ft3

Standard Sizes

Fused silica is available in the following sizings:

4 / 10, 6 / 50, 10 / 20, 20 / 50, 30 / 50, 50 / 100, 100 / 200, 120/F, 200/F, 325/F
Custom sizing and blending is also available.

This information has been sourced, reviewed and adapted from materials provided by Washington Mills.

For more information on this source, please visit Washington Mills.


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