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Synthetic Sapphire vs. Cordierite

Both synthetic sapphire and cordierite are oxide-based engineering ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2700
420
Elastic (Young's, Tensile) Modulus, GPa 450
62
Flexural Strength, MPa 1090
17 to 32
Fracture Toughness, MPa-m1/2 1.9
2.0
Tensile Strength: Ultimate (UTS), MPa 2470
190

Thermal Properties

Maximum Temperature: Mechanical, °C 2000
1150
Specific Heat Capacity, J/kg-K 760
800 to 850
Thermal Conductivity, W/m-K 30
1.3 to 1.7
Thermal Expansion, µm/m-K 5.3
2.9 to 4.8

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 10
4.7
Dielectric Strength (Breakdown Potential), kV/mm 9.9
7.7
Electrical Resistivity Order of Magnitude, 10x Ω-m 17
9.5

Otherwise Unclassified Properties

Density, g/cm3 4.0
2.0 to 2.2

Common Calculations

Stiffness to Weight: Axial, points 63
15 to 17
Stiffness to Weight: Bending, points 64
59 to 67
Strength to Weight: Axial, points 170
24 to 27
Strength to Weight: Bending, points 100
33 to 38
Thermal Diffusivity, mm2/s 9.9
0.74 to 1.0
Thermal Shock Resistance, points 74
47 to 78