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Alumina vs. Steatite

Both alumina and steatite are oxide-based engineering ceramics. There are 23 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is alumina and the bottom bar is steatite.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1920 to 2750
540 to 620
Elastic (Young's, Tensile) Modulus, GPa 220 to 370
68 to 120
Flexural Strength, MPa 260 to 430
32 to 150
Poisson's Ratio 0.22 to 0.24
0.23
Tensile Strength: Ultimate (UTS), MPa 210 to 290
60 to 220

Thermal Properties

Maximum Temperature: Mechanical, °C 650 to 1730
750 to 1230
Maximum Thermal Shock, °C 200 to 300
90 to 160
Specific Heat Capacity, J/kg-K 870 to 940
850 to 860
Thermal Conductivity, W/m-K 14 to 30
1.8 to 2.5
Thermal Expansion, µm/m-K 6.7 to 8.2
7.0 to 9.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 8.0 to 9.0
6.0
Dielectric Constant (Relative Permittivity) At 1 MHz 7.8 to 11
5.7 to 6.5
Dielectric Strength (Breakdown Potential), kV/mm 8.9 to 12
7.9 to 16
Electrical Dissipation At 1 Hz 0.00031 to 0.0011
0.0014 to 0.022
Electrical Dissipation At 1 MHz 0.00049 to 0.0013
0.0010 to 0.0060
Electrical Resistivity Order of Magnitude, 10x Ω-m 6.2 to 14
8.0 to 11

Otherwise Unclassified Properties

Density, g/cm3 3.4 to 4.1
1.9 to 2.8

Common Calculations

Stiffness to Weight: Axial, points 35 to 53
14 to 32
Stiffness to Weight: Bending, points 57 to 62
52 to 83
Strength to Weight: Axial, points 14 to 23
6.4 to 32
Strength to Weight: Bending, points 19 to 28
13 to 42
Thermal Diffusivity, mm2/s 3.7 to 10
0.79 to 1.1
Thermal Shock Resistance, points 4.9 to 14
5.1 to 33