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Optical Silicon vs. Potassium Chloride

Both optical silicon and potassium chloride are non-glass optical ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is optical silicon and the bottom bar is potassium chloride.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 150
28
Poisson's Ratio 0.28
0.18
Shear Modulus, GPa 80
8.5

Thermal Properties

Melting Onset (Solidus), °C 1560
780
Specific Heat Capacity, J/kg-K 700
690
Thermal Conductivity, W/m-K 150
6.5
Thermal Expansion, µm/m-K 3.0
36

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 12
4.6

Otherwise Unclassified Properties

Density, g/cm3 2.3
2.0
Light Transmission Range, µm 1.2 to 15
0.21 to 20
Refractive Index 3.5
1.6

Common Calculations

Stiffness to Weight: Axial, points 35
7.7
Stiffness to Weight: Bending, points 75
51
Thermal Diffusivity, mm2/s 93
4.7