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Potassium Chloride vs. Alumina

Potassium chloride belongs to the non-glass optical ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 12 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 chloride and the bottom bar is alumina.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 28
220 to 370
Poisson's Ratio 0.18
0.22 to 0.24

Thermal Properties

Melting Onset (Solidus), °C 780
2040
Specific Heat Capacity, J/kg-K 690
870 to 940
Thermal Conductivity, W/m-K 6.5
14 to 30
Thermal Expansion, µm/m-K 36
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.6
7.8 to 11
Electrical Dissipation At 1 MHz 0.00010
0.00049 to 0.0013

Otherwise Unclassified Properties

Density, g/cm3 2.0
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 7.7
35 to 53
Stiffness to Weight: Bending, points 51
57 to 62
Thermal Diffusivity, mm2/s 4.7
3.7 to 10