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Potassium Chloride vs. Borosilicate Glass

Potassium chloride belongs to the non-glass optical ceramics classification, while borosilicate glass belongs to the glass and glass-ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is potassium chloride and the bottom bar is borosilicate glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 28
67 to 80
Poisson's Ratio 0.18
0.21

Thermal Properties

Melting Onset (Solidus), °C 780
560
Specific Heat Capacity, J/kg-K 690
830
Thermal Conductivity, W/m-K 6.5
1.2
Thermal Expansion, µm/m-K 36
3.3 to 5.1

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.6
5.4
Electrical Dissipation At 1 MHz 0.00010
0.0017 to 0.0088

Otherwise Unclassified Properties

Density, g/cm3 2.0
2.2 to 2.6
Light Transmission Range, µm 0.21 to 20
0.3 to 2.5
Refractive Index 1.6
1.5

Common Calculations

Stiffness to Weight: Axial, points 7.7
15 to 17
Stiffness to Weight: Bending, points 51
55 to 61
Thermal Diffusivity, mm2/s 4.7
0.54 to 0.63