Alumina vs. ASTM B631 Class C

Alumina and ASTM B631 class C belong to fundamentally different material chemistries. Alumina is a ceramic material, while ASTM B631 class C is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 9 material properties with values for both materials. Properties with values for just one material (25, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is alumina and the bottom bar is ASTM B631 class C.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		3.4 to 4.1
Density, g/cm³		13 to 14

Elastic (Young's, Tensile) Modulus, GPa		220 to 370
Elastic (Young's, Tensile) Modulus, GPa		180 to 190

Poisson's Ratio		0.22 to 0.24
Poisson's Ratio		0.32

Specific Heat Capacity, J/kg-K		870 to 940
Specific Heat Capacity, J/kg-K		180

Stiffness to Weight: Axial, points		35 to 53
Stiffness to Weight: Axial, points		7.4 to 7.6

Stiffness to Weight: Bending, points		57 to 62
Stiffness to Weight: Bending, points		14

Thermal Conductivity, W/m-K		14 to 30
Thermal Conductivity, W/m-K		450 to 490

Thermal Diffusivity, mm²/s		3.7 to 10
Thermal Diffusivity, mm²/s		180 to 200

Thermal Expansion, µm/m-K		6.7 to 8.2
Thermal Expansion, µm/m-K		14

Alumina vs. ASTM B631 Class C

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