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Grade A Lava vs. Alumina

Both grade A lava and alumina are oxide-based engineering ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is grade A lava and the bottom bar is alumina.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 76 to 170
1920 to 2750
Flexural Strength, MPa 28 to 69
260 to 430
Tensile Strength: Ultimate (UTS), MPa 6.9 to 21
210 to 290

Thermal Properties

Maximum Temperature: Mechanical, °C 650 to 1130
650 to 1730
Specific Heat Capacity, J/kg-K 840
870 to 940
Thermal Conductivity, W/m-K 2.0
14 to 30
Thermal Expansion, µm/m-K 2.5 to 3.3
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.3 to 5.8
7.8 to 11
Dielectric Strength (Breakdown Potential), kV/mm 3.2 to 3.9
8.9 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.3 to 2.5
3.4 to 4.1

Common Calculations

Strength to Weight: Axial, points 0.77 to 2.5
14 to 23
Strength to Weight: Bending, points 3.2 to 7.3
19 to 28
Thermal Diffusivity, mm2/s 1.0
3.7 to 10