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Infrared Transmitting Glass vs. Graphite

Infrared transmitting glass belongs to the glass and glass-ceramics classification, while graphite belongs to the non-oxide engineering ceramics. There are 7 material properties with values for both materials. Properties with values for just one material (12, 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 graphite.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.4 to 4.8
1.8
Elastic (Young's, Tensile) Modulus, GPa 18 to 63
21
Flexural Strength, MPa 20 to 79
80
Stiffness to Weight: Axial, points 2.3 to 7.3
6.7
Stiffness to Weight: Bending, points 20 to 28
53
Thermal Conductivity, W/m-K 0.0060 to 0.23
6.0
Thermal Expansion, µm/m-K 9.0 to 17
4.9