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Cordierite

Cordierite is an oxide-based engineering ceramic. It can have a fairly low density and a moderately low thermal conductivity among oxide-based engineering ceramics.

The properties of cordierite include four 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 cordierite 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.

Mechanical Properties

Compressive (Crushing) Strength

420 MPa 61 x 103 psi

Elastic (Young's, Tensile) Modulus

62 GPa 8.9 x 106 psi

Flexural Strength

17 to 32 MPa 2.4 to 4.7 x 103 psi

Fracture Toughness

2.0 MPa-m1/2 1.8 x 103 psi-in1/2

Tensile Strength: Ultimate (UTS)

190 MPa 28 x 103 psi

Thermal Properties

Maximum Temperature: Mechanical

1150 °C 2100 °F

Maximum Thermal Shock

290 to 390 °C 550 to 740 °F

Specific Heat Capacity

800 to 850 J/kg-K 0.19 to 0.2 BTU/lb-°F

Thermal Conductivity

1.3 to 1.7 W/m-K 0.72 to 1.0 BTU/h-ft-°F

Thermal Expansion

2.9 to 4.8 µm/m-K

Other Material Properties

Density

2.0 to 2.2 g/cm3 120 to 140 lb/ft3

Dielectric Constant (Relative Permittivity) At 1 MHz

4.7

Dielectric Strength (Breakdown Potential)

7.7 kV/mm 0.3 V/mil

Electrical Resistivity Order of Magnitude

9.5 10x Ω-m

Common Calculations

Stiffness to Weight: Axial

15 to 17 points

Stiffness to Weight: Bending

59 to 67 points

Strength to Weight: Axial

24 to 27 points

Strength to Weight: Bending

33 to 38 points

Thermal Diffusivity

0.74 to 1.0 m2/s

Thermal Shock Resistance

47 to 78 points

Followup Questions

Further Reading

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