# ESD-Safe Alumina

ESD alumina is a grade of alumina. The graph bars on the material properties cards below compare ESD alumina 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

2020 *MPa* 290 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

370 *GPa* 54 *x 10 ^{6} psi*

Flexural Strength

300 *MPa* 44 *x 10 ^{3} psi*

Fracture Toughness

4.0 *MPa-m ^{1/2}* 3.6

*x 10*

^{3}psi-in^{1/2}Poisson's Ratio

0.22

## Thermal Properties

Maximum Temperature: Mechanical

650 *°C* 1200 *°F*

Maximum Thermal Shock

200 *°C* 390 *°F*

Melting Onset (Solidus)

2040 *°C* 3700 *°F*

Thermal Conductivity

25 *W/m-K* 14 *BTU/h-ft-°F*

Thermal Expansion

8.0 *µm/m-K*

## Other Material Properties

Density

3.9 *g/cm ^{3}* 240

*lb/ft*

^{3}Dielectric Constant (Relative Permittivity) At 1 MHz

9.6

Electrical Dissipation At 1 MHz

0.0010

Electrical Resistivity Order of Magnitude

6.2 *10 ^{x} Ω-m*

## Common Calculations

Stiffness to Weight: Axial

53 *points*

Stiffness to Weight: Bending

62 *points*

Strength to Weight: Axial

14 to 23 *points*

Strength to Weight: Bending

19 to 28 *points*

Thermal Diffusivity

3.7 to 10 *mm ^{2}/s*

Thermal Shock Resistance

4.9 to 14 *points*

## Followup Questions

## Further Reading

Ceramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford and Robert H. Doremus (editors), 2008

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

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