# Dense Forsterite (IEC 60672 Type C-250)

C-250 forsterite is a grade of forsterite. The graph bars on the material properties cards below compare C-250 forsterite 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

Maximum Thermal Shock

90 *°C* 190 *°F*

Specific Heat Capacity

850 *J/kg-K* 0.2 *BTU/lb-°F*

Thermal Conductivity

3.5 *W/m-K* 2.0 *BTU/h-ft-°F*

Thermal Expansion

10 *µm/m-K*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

7.0

Dielectric Constant (Relative Permittivity) At 1 MHz

6.2

Dielectric Strength (Breakdown Potential)

7.9 *kV/mm* 0.31 *V/mil*

Electrical Dissipation At 1 Hz

0.0013

Electrical Dissipation At 1 MHz

0.00030

Electrical Resistivity Order of Magnitude

11 *10 ^{x} Ω-m*

## Other Material Properties

Density

3.1 *g/cm ^{3}* 200

*lb/ft*

^{3}Flexural Strength

160 *MPa* 23 *x 10 ^{3} psi*

## Common Calculations

Thermal Diffusivity

1.3 *mm ^{2}/s*

## Followup Questions

## Further Reading

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