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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


Dielectric Constant (Relative Permittivity) At 1 MHz


Electrical Dissipation At 1 MHz


Other Material Properties


2.7 g/cm3 170 lb/ft3

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Flexural Strength

53 MPa 7.7 x 103 psi

Common Calculations

Stiffness to Weight: Axial

21 points

Stiffness to Weight: Bending

58 points

Thermal Diffusivity

3.1 mm2/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