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Synthetic Sapphire vs. Calcium Fluoride

Synthetic sapphire belongs to the oxide-based engineering ceramics classification, while calcium fluoride belongs to the non-glass optical 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 synthetic sapphire and the bottom bar is calcium fluoride.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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