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Potassium Bromide vs. Mullite

Potassium bromide belongs to the non-glass optical ceramics classification, while mullite belongs to the oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
110 to 170
Poisson's Ratio 0.17
0.25

Thermal Properties

Specific Heat Capacity, J/kg-K 450
950
Thermal Conductivity, W/m-K 4.8
3.5 to 11
Thermal Expansion, µm/m-K 39
5.8

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.9
6.3
Electrical Dissipation At 1 MHz 0.00020
0.0025

Otherwise Unclassified Properties

Density, g/cm3 2.8
2.7 to 3.0

Common Calculations

Stiffness to Weight: Axial, points 4.7
22 to 31
Stiffness to Weight: Bending, points 35
58 to 62
Thermal Diffusivity, mm2/s 3.9
1.4 to 3.7