# 50-65% Al_{2}O_{3} Mullite (IEC 60672 Type C-610)

C-610 mullite is a grade of mullite. The graph bars on the material properties cards below compare C-610 mullite 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

800 *MPa* 120 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

110 *GPa* 16 *x 10 ^{6} psi*

Flexural Strength

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

Fracture Toughness

2.0 *MPa-m ^{1/2}* 1.8

*x 10*

^{3}psi-in^{1/2}Knoop Hardness

750

Poisson's Ratio

0.25

Tensile Strength: Ultimate (UTS)

160 *MPa* 24 *x 10 ^{3} psi*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

8.0

Dielectric Constant (Relative Permittivity) At 1 MHz

6.3

Dielectric Strength (Breakdown Potential)

16 *kV/mm* 0.63 *V/mil*

Electrical Dissipation At 1 MHz

0.0025

Electrical Resistivity Order of Magnitude

10 *10 ^{x} Ω-m*

## Other Material Properties

Density

2.7 *g/cm ^{3}* 170

*lb/ft*

^{3}Maximum Temperature: Mechanical

1680 *°C* 3060 *°F*

Maximum Thermal Shock

230 *°C* 450 *°F*

Specific Heat Capacity

950 *J/kg-K* 0.23 *BTU/lb-°F*

Thermal Conductivity

3.5 *W/m-K* 2.0 *BTU/h-ft-°F*

Thermal Expansion

5.8 *µm/m-K*

## Common Calculations

Stiffness to Weight: Axial

22 *points*

Stiffness to Weight: Bending

58 *points*

Strength to Weight: Axial

17 *points*

Strength to Weight: Bending

24 *points*

Thermal Diffusivity

1.4 *mm ^{2}/s*

Thermal Shock Resistance

19 *points*

## Followup Questions

## Further Reading

Mullite, Hartmut Schneider and Sridhar Komarneni (editors), 2005

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

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

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