# 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 10 ^{3} psi*

Flexural Strength

28 *MPa* 4.0 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

6.9 *MPa* 1.0 *x 10 ^{3} 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/cm ^{3}* 160

*lb/ft*

^{3}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 *mm ^{2}/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