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Potassium Bromide vs. Calcium Fluoride

Both potassium bromide and calcium fluoride are non-glass optical ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is potassium bromide and the bottom bar is calcium fluoride.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
80
Poisson's Ratio 0.17
0.26
Shear Modulus, GPa 7.0
34

Thermal Properties

Melting Onset (Solidus), °C 730
1420
Specific Heat Capacity, J/kg-K 450
860
Thermal Conductivity, W/m-K 4.8
9.7
Thermal Expansion, µm/m-K 39
19

Otherwise Unclassified Properties

Density, g/cm3 2.8
3.2
Light Transmission Range, µm 0.22 to 26
0.15 to 9.0
Refractive Index 1.8
1.4

Common Calculations

Stiffness to Weight: Axial, points 4.7
14
Stiffness to Weight: Bending, points 35
45
Thermal Diffusivity, mm2/s 3.9
3.5