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Calcium Fluoride vs. Synthetic Sapphire

Calcium fluoride belongs to the non-glass optical ceramics classification, while synthetic sapphire belongs to the oxide-based engineering ceramics. There are 14 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 80
450
Knoop Hardness 160
1860
Poisson's Ratio 0.26
0.28
Shear Modulus, GPa 34
150

Thermal Properties

Melting Onset (Solidus), °C 1420
2050
Specific Heat Capacity, J/kg-K 860
760
Thermal Conductivity, W/m-K 9.7
30
Thermal Expansion, µm/m-K 19
5.3

Otherwise Unclassified Properties

Density, g/cm3 3.2
4.0
Light Transmission Range, µm 0.15 to 9.0
0.17 to 5.5
Refractive Index 1.4
1.8

Common Calculations

Stiffness to Weight: Axial, points 14
63
Stiffness to Weight: Bending, points 45
64
Thermal Diffusivity, mm2/s 3.5
9.9