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Magnesium Fluoride vs. Mullite

Magnesium fluoride belongs to the non-glass optical ceramics classification, while mullite belongs to the oxide-based engineering 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 magnesium fluoride and the bottom bar is mullite.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 3.2
2.7 to 3.0
Dielectric Constant (Relative Permittivity) At 1 MHz 5.2
6.3
Elastic (Young's, Tensile) Modulus, GPa 130
110 to 170
Poisson's Ratio 0.27
0.25
Specific Heat Capacity, J/kg-K 980
950
Stiffness to Weight: Axial, points 22
22 to 31
Stiffness to Weight: Bending, points 52
58 to 62
Thermal Conductivity, W/m-K 28
3.5 to 11
Thermal Diffusivity, mm2/s 8.8
1.4 to 3.7
Thermal Expansion, µm/m-K 11
5.8