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Cordierite vs. Alumina

Both cordierite and alumina are oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is cordierite and the bottom bar is alumina.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 420
1920 to 2750
Elastic (Young's, Tensile) Modulus, GPa 62
220 to 370
Flexural Strength, MPa 17 to 32
260 to 430
Fracture Toughness, MPa-m1/2 2.0
3.7 to 7.2
Tensile Strength: Ultimate (UTS), MPa 190
210 to 290

Thermal Properties

Maximum Temperature: Mechanical, °C 1150
650 to 1730
Maximum Thermal Shock, °C 290 to 390
200 to 300
Specific Heat Capacity, J/kg-K 800 to 850
870 to 940
Thermal Conductivity, W/m-K 1.3 to 1.7
14 to 30
Thermal Expansion, µm/m-K 2.9 to 4.8
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.7
7.8 to 11
Dielectric Strength (Breakdown Potential), kV/mm 7.7
8.9 to 12
Electrical Resistivity Order of Magnitude, 10x Ω-m 9.5
6.2 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.0 to 2.2
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 15 to 17
35 to 53
Stiffness to Weight: Bending, points 59 to 67
57 to 62
Strength to Weight: Axial, points 24 to 27
14 to 23
Strength to Weight: Bending, points 33 to 38
19 to 28
Thermal Diffusivity, mm2/s 0.74 to 1.0
3.7 to 10
Thermal Shock Resistance, points 47 to 78
4.9 to 14