# Graphite

Graphite is a non-oxide engineering ceramic. It has the lowest thermal conductivity among non-oxide engineering ceramics. In addition, it has the lowest tensile strength and a very low density. The graph bars on the material properties cards below compare graphite to other non-oxide 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

90 *MPa* 13 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

21 *GPa* 3.0 *x 10 ^{6} psi*

Flexural Strength

80 *MPa* 12 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

18 *MPa* 2.6 *x 10 ^{3} psi*

## Thermal Properties

Maximum Temperature: Corrosion

180 *°C* 360 *°F*

Maximum Temperature: Mechanical

220 *°C* 430 *°F*

Thermal Conductivity

6.0 *W/m-K* 3.5 *BTU/h-ft-°F*

Thermal Expansion

4.9 *µm/m-K*

## Otherwise Unclassified Properties

Calomel Potential

250 *mV*

Density

1.8 *g/cm ^{3}* 110

*lb/ft*

^{3}## Common Calculations

Stiffness to Weight: Axial

6.7 *points*

Stiffness to Weight: Bending

53 *points*

Strength to Weight: Axial

2.9 *points*

Strength to Weight: Bending

8.7 *points*

Thermal Shock Resistance

12 *points*

## 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