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High-silica Glass vs. Optical Silicon

High-silica glass belongs to the glass and glass-ceramics classification, while optical silicon belongs to the non-glass optical ceramics. There are 6 material properties with values for both materials. Properties with values for just one material (23, in this case) are not shown.

For each property being compared, the top bar is high-silica glass and the bottom bar is optical silicon.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.4
2.3
Elastic (Young's, Tensile) Modulus, GPa 78
150
Flexural Strength, MPa 34
300
Stiffness to Weight: Axial, points 19
35
Stiffness to Weight: Bending, points 61
75
Thermal Expansion, µm/m-K 0.6 to 0.75
3.0