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Infrared Transmitting Glass vs. Silica Aerogel

Infrared transmitting glass belongs to the glass and glass-ceramics classification, while silica aerogel belongs to the oxide-based engineering ceramics. There are 7 material properties with values for both materials. Properties with values for just one material (9, 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 silica aerogel.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.4 to 4.8
0.1
Elastic (Young's, Tensile) Modulus, GPa 18 to 63
0.0050
Poisson's Ratio 0.28 to 0.3
0.2
Stiffness to Weight: Axial, points 2.3 to 7.3
0.028
Stiffness to Weight: Bending, points 20 to 28
57
Thermal Conductivity, W/m-K 0.0060 to 0.23
0.016
Thermal Expansion, µm/m-K 9.0 to 17
2.0