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Grade A Lava (Alumina Silicate)

Grade A lava is an oxide-based engineering ceramic. It can have a moderately low dielectric strength among oxide-based engineering ceramics. In addition, it can have a moderately low tensile strength and a moderately low density.

The properties of grade A lava include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare grade A lava to other oxide-based engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Compressive (Crushing) Strength

76 to 170 MPa 11 to 25 x 103 psi

Flexural Strength

28 to 69 MPa 4.0 to 10 x 103 psi

Tensile Strength: Ultimate (UTS)

6.9 to 21 MPa 1.0 to 3.0 x 103 psi

Thermal Properties

Maximum Temperature: Corrosion

1150 °C 2100 °F

Maximum Temperature: Mechanical

650 to 1130 °C 1200 to 2060 °F

Specific Heat Capacity

840 J/kg-K 0.2 BTU/lb-°F

Thermal Conductivity

2.0 W/m-K 1.2 BTU/h-ft-°F

Thermal Expansion

2.5 to 3.3 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

5.3 to 5.8

Dielectric Strength (Breakdown Potential)

3.2 to 3.9 kV/mm 0.12 to 0.15 V/mil

Otherwise Unclassified Properties

Density

2.3 to 2.5 g/cm3 140 to 160 lb/ft3

Water Absorption At Saturation

2.5 %

Common Calculations

Strength to Weight: Axial

0.77 to 2.5 points

Strength to Weight: Bending

3.2 to 7.3 points

Thermal Diffusivity

1.0 m2/s

Followup Questions

Further Reading

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015