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Synthetic Sapphire vs. C-820 Magnesia Ceramic

Both synthetic sapphire and C-820 magnesia ceramic are oxide-based engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is synthetic sapphire and the bottom bar is C-820 magnesia ceramic.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.0
2.7
Dielectric Constant (Relative Permittivity) At 1 MHz 10
9.6
Elastic (Young's, Tensile) Modulus, GPa 450
100
Flexural Strength, MPa 1090
53
Specific Heat Capacity, J/kg-K 760
950
Stiffness to Weight: Axial, points 63
21
Stiffness to Weight: Bending, points 64
58
Thermal Conductivity, W/m-K 30
8.0
Thermal Diffusivity, mm2/s 9.9
3.1
Thermal Expansion, µm/m-K 5.3
11