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Infrared Transmitting Glass vs. Alpha Quartz

Infrared transmitting glass belongs to the glass and glass-ceramics classification, while alpha quartz belongs to the non-glass optical ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.4 to 4.8
2.7
Elastic (Young's, Tensile) Modulus, GPa 18 to 63
91
Poisson's Ratio 0.28 to 0.3
0.13
Refractive Index 1.8 to 2.1
1.6
Specific Heat Capacity, J/kg-K 360 to 430
720
Stiffness to Weight: Axial, points 2.3 to 7.3
19
Stiffness to Weight: Bending, points 20 to 28
57
Thermal Conductivity, W/m-K 0.0060 to 0.23
8.5
Thermal Diffusivity, mm2/s 0.0029 to 0.14
4.4
Thermal Expansion, µm/m-K 9.0 to 17
9.5