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Silica Aerogel vs. Graphite

Silica aerogel belongs to the oxide-based engineering ceramics classification, while graphite belongs to the non-oxide engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (7, 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 silica aerogel and the bottom bar is graphite.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 0.1
1.8
Elastic (Young's, Tensile) Modulus, GPa 0.0050
21
Stiffness to Weight: Axial, points 0.028
6.7
Stiffness to Weight: Bending, points 57
53
Strength to Weight: Axial, points 0.044
2.9
Strength to Weight: Bending, points 1.4
8.7
Tensile Strength: Ultimate (UTS), MPa 0.016
18
Thermal Conductivity, W/m-K 0.016
6.0
Thermal Expansion, µm/m-K 2.0
4.9
Thermal Shock Resistance, points 110
12