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Silica Aerogel vs. Mullite

Both silica aerogel and mullite are oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (14, 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 mullite.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 0.0050
110 to 170
Poisson's Ratio 0.2
0.25
Tensile Strength: Ultimate (UTS), MPa 0.016
160

Thermal Properties

Thermal Conductivity, W/m-K 0.016
3.5 to 11
Thermal Expansion, µm/m-K 2.0
5.8

Otherwise Unclassified Properties

Density, g/cm3 0.1
2.7 to 3.0

Common Calculations

Stiffness to Weight: Axial, points 0.028
22 to 31
Stiffness to Weight: Bending, points 57
58 to 62
Strength to Weight: Axial, points 0.044
15 to 17
Strength to Weight: Bending, points 1.4
22 to 24
Thermal Shock Resistance, points 110
12 to 19