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Steatite

Steatite is an oxide-based engineering ceramic.

The properties of steatite include five common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare steatite 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 Temperature: Mechanical

750 to 1230 °C 1380 to 2240 °F

Maximum Thermal Shock

90 to 160 °C 190 to 330 °F

Specific Heat Capacity

850 to 860 J/kg-K 0.2 to 0.21 BTU/lb-°F

Thermal Conductivity

1.8 to 2.5 W/m-K 1.0 to 1.5 BTU/h-ft-°F

Thermal Expansion

7.0 to 9.0 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz

6.0

Dielectric Constant (Relative Permittivity) At 1 MHz

5.7 to 6.5

Dielectric Strength (Breakdown Potential)

7.9 to 16 kV/mm 0.31 to 0.61 V/mil

Electrical Dissipation At 1 Hz

0.0014 to 0.022

Electrical Dissipation At 1 MHz

0.0010 to 0.0060

Electrical Resistivity Order of Magnitude

8.0 to 11 10x Ω-m

Other Material Properties

Compressive (Crushing) Strength

540 to 620 MPa 78 to 90 x 103 psi

Density

1.9 to 2.8 g/cm3 120 to 170 lb/ft3

Elastic (Young's, Tensile) Modulus

68 to 120 GPa 9.9 to 17 x 106 psi

Flexural Strength

32 to 150 MPa 4.6 to 21 x 103 psi

Poisson's Ratio

0.23

Tensile Strength: Ultimate (UTS)

60 to 220 MPa 8.6 to 32 x 103 psi

Common Calculations

Stiffness to Weight: Axial

14 to 32 points

Stiffness to Weight: Bending

52 to 83 points

Strength to Weight: Axial

6.4 to 32 points

Strength to Weight: Bending

13 to 42 points

Thermal Diffusivity

0.79 to 1.1 m2/s

Thermal Shock Resistance

5.1 to 33 points

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015