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Steatite vs. Alumina

Both steatite and alumina 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 steatite and the bottom bar is alumina.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 1.9 to 2.8
3.4 to 4.1

Common Calculations

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