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Potassium Bromide vs. Optical Silicon

Both potassium bromide and optical silicon 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 potassium bromide and the bottom bar is optical silicon.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
150
Poisson's Ratio 0.17
0.28
Shear Modulus, GPa 7.0
80

Thermal Properties

Melting Onset (Solidus), °C 730
1560
Specific Heat Capacity, J/kg-K 450
700
Thermal Conductivity, W/m-K 4.8
150
Thermal Expansion, µm/m-K 39
3.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.9
12

Otherwise Unclassified Properties

Density, g/cm3 2.8
2.3
Light Transmission Range, µm 0.22 to 26
1.2 to 15
Refractive Index 1.8
3.5

Common Calculations

Stiffness to Weight: Axial, points 4.7
35
Stiffness to Weight: Bending, points 35
75
Thermal Diffusivity, mm2/s 3.9
93