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Alpha Quartz vs. Infrared Transmitting Glass

Alpha quartz belongs to the non-glass optical ceramics classification, while infrared transmitting glass belongs to the glass and glass-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 alpha quartz and the bottom bar is infrared transmitting glass.

Metric UnitsUS Customary Units

Material Properties

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