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Mullite vs. Potassium Bromide

Mullite belongs to the oxide-based engineering ceramics classification, while potassium bromide belongs to the non-glass optical 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 mullite and the bottom bar is potassium bromide.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 2.7 to 3.0
2.8

Common Calculations

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