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Mullite vs. Calcium Fluoride

Mullite belongs to the oxide-based engineering ceramics classification, while calcium fluoride belongs to the non-glass optical ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is mullite and the bottom bar is calcium fluoride.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.7 to 3.0
3.2
Elastic (Young's, Tensile) Modulus, GPa 110 to 170
80
Knoop Hardness 750
160
Poisson's Ratio 0.25
0.26
Specific Heat Capacity, J/kg-K 950
860
Stiffness to Weight: Axial, points 22 to 31
14
Stiffness to Weight: Bending, points 58 to 62
45
Thermal Conductivity, W/m-K 3.5 to 11
9.7
Thermal Diffusivity, mm2/s 1.4 to 3.7
3.5
Thermal Expansion, µm/m-K 5.8
19