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Potassium Bromide vs. Beryllia

Potassium bromide belongs to the non-glass optical ceramics classification, while beryllia belongs to the oxide-based engineering ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
350
Poisson's Ratio 0.17
0.26
Shear Modulus, GPa 7.0
180

Thermal Properties

Specific Heat Capacity, J/kg-K 450
1050
Thermal Conductivity, W/m-K 4.8
270
Thermal Expansion, µm/m-K 39
8.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.9
6.6
Electrical Dissipation At 1 MHz 0.00020
0.00060

Otherwise Unclassified Properties

Density, g/cm3 2.8
2.9

Common Calculations

Stiffness to Weight: Axial, points 4.7
67
Stiffness to Weight: Bending, points 35
82
Thermal Diffusivity, mm2/s 3.9
89