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Mullite vs. High-alumina Refractory

Both mullite and high-alumina refractory are oxide-based engineering ceramics. There are 8 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.7 to 3.0
2.1
Flexural Strength, MPa 130 to 160
28
Maximum Temperature: Mechanical, °C 1680
1200
Maximum Thermal Shock, °C 170 to 230
210
Specific Heat Capacity, J/kg-K 950
800
Thermal Conductivity, W/m-K 3.5 to 11
1.5
Thermal Diffusivity, mm2/s 1.4 to 3.7
0.87
Thermal Expansion, µm/m-K 5.8
4.3