# Porous Magnesia Ceramic (IEC 60672 Type C-820)

C-820 magnesia ceramic is an oxide-based engineering ceramic. It has a moderately high heat capacity and a moderately high thermal conductivity among oxide-based engineering ceramics. The graph bars on the material properties cards below compare C-820 magnesia ceramic 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.

## Thermal Properties

Specific Heat Capacity

950 *J/kg-K* 0.23 *BTU/lb-°F*

Thermal Conductivity

8.0 *W/m-K* 4.6 *BTU/h-ft-°F*

Thermal Expansion

11 *µm/m-K*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

10

Dielectric Constant (Relative Permittivity) At 1 MHz

9.6

Electrical Dissipation At 1 MHz

0.00030

## Other Material Properties

Density

2.7 *g/cm ^{3}* 170

*lb/ft*

^{3}Elastic (Young's, Tensile) Modulus

100 *GPa* 15 *x 10 ^{6} psi*

Flexural Strength

53 *MPa* 7.7 *x 10 ^{3} psi*

## Common Calculations

Stiffness to Weight: Axial

21 *points*

Stiffness to Weight: Bending

58 *points*

Thermal Diffusivity

3.1 *mm ^{2}/s*

## Followup Questions

## Further Reading

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

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

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