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/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