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Infrared Transmitting Glass vs. Potassium Chloride

Infrared transmitting glass belongs to the glass and glass-ceramics classification, while potassium chloride belongs to the non-glass optical ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.4 to 4.8
2.0
Elastic (Young's, Tensile) Modulus, GPa 18 to 63
28
Poisson's Ratio 0.28 to 0.3
0.18
Refractive Index 1.8 to 2.1
1.6
Specific Heat Capacity, J/kg-K 360 to 430
690
Stiffness to Weight: Axial, points 2.3 to 7.3
7.7
Stiffness to Weight: Bending, points 20 to 28
51
Thermal Conductivity, W/m-K 0.0060 to 0.23
6.5
Thermal Diffusivity, mm2/s 0.0029 to 0.14
4.7
Thermal Expansion, µm/m-K 9.0 to 17
36