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Aluminosilicate Glass vs. Optical Silicon

Aluminosilicate 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 (18, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

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