Unfired Grade A Lava
Unfired grade A lava is a grade of grade A lava. The graph bars on the material properties cards below compare unfired 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 MPa 11 x 103 psi
Flexural Strength
28 MPa 4.0 x 103 psi
Tensile Strength: Ultimate (UTS)
6.9 MPa 1.0 x 103 psi
Thermal Properties
Maximum Temperature: Corrosion
1150 °C 2100 °F
Maximum Temperature: Mechanical
650 °C 1200 °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 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 MHz
5.8
Dielectric Strength (Breakdown Potential)
3.2 kV/mm 0.12 V/mil
Otherwise Unclassified Properties
Density
2.5 g/cm3 160 lb/ft3
Water Absorption At Saturation
2.5 %
Common Calculations
Strength to Weight: Axial
0.77 points
Strength to Weight: Bending
3.2 points
Thermal Diffusivity
1.0 mm2/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