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Synthetic Sapphire vs. High-alumina Refractory

Both synthetic sapphire and high-alumina refractory are oxide-based engineering ceramics. There are 7 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is synthetic sapphire and the bottom bar is high-alumina refractory.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 4.0
2.1
Flexural Strength, MPa 1090
28
Maximum Temperature: Mechanical, °C 2000
1200
Specific Heat Capacity, J/kg-K 760
800
Thermal Conductivity, W/m-K 30
1.5
Thermal Diffusivity, mm2/s 9.9
0.87
Thermal Expansion, µm/m-K 5.3
4.3