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Synthetic Sapphire vs. Graphite

Synthetic sapphire belongs to the oxide-based engineering ceramics classification, while graphite belongs to the non-oxide engineering ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2700
90
Elastic (Young's, Tensile) Modulus, GPa 450
21
Flexural Strength, MPa 1090
80
Tensile Strength: Ultimate (UTS), MPa 2470
18

Thermal Properties

Maximum Temperature: Mechanical, °C 2000
220
Thermal Conductivity, W/m-K 30
6.0
Thermal Expansion, µm/m-K 5.3
4.9

Otherwise Unclassified Properties

Density, g/cm3 4.0
1.8

Common Calculations

Stiffness to Weight: Axial, points 63
6.7
Stiffness to Weight: Bending, points 64
53
Strength to Weight: Axial, points 170
2.9
Strength to Weight: Bending, points 100
8.7
Thermal Shock Resistance, points 74
12