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Optical Silicon vs. Aluminosilicate Glass

Optical silicon belongs to the non-glass optical ceramics classification, while aluminosilicate glass belongs to the glass and glass-ceramics. There are 6 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.3
2.4
Dielectric Constant (Relative Permittivity) At 1 MHz 12
6.3
Elastic (Young's, Tensile) Modulus, GPa 150
87
Fracture Toughness, MPa-m1/2 3.5
0.9
Stiffness to Weight: Axial, points 35
20
Stiffness to Weight: Bending, points 75
63