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Synthetic Sapphire vs. Engineering Porcelain

Both synthetic sapphire and engineering porcelain are oxide-based engineering ceramics. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2700
590
Elastic (Young's, Tensile) Modulus, GPa 450
67 to 150
Flexural Strength, MPa 1090
43 to 160
Fracture Toughness, MPa-m1/2 1.9
2.0
Knoop Hardness 1860
600
Poisson's Ratio 0.28
0.17
Shear Modulus, GPa 150
34
Tensile Strength: Ultimate (UTS), MPa 2470
130

Thermal Properties

Maximum Temperature: Mechanical, °C 2000
1170
Specific Heat Capacity, J/kg-K 760
600 to 1000
Thermal Conductivity, W/m-K 30
1.8 to 6.5
Thermal Expansion, µm/m-K 5.3
2.0 to 6.6

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 10
6.5
Dielectric Strength (Breakdown Potential), kV/mm 9.9
11 to 25
Electrical Resistivity Order of Magnitude, 10x Ω-m 17
9.0 to 12

Otherwise Unclassified Properties

Density, g/cm3 4.0
2.3 to 3.0

Common Calculations

Stiffness to Weight: Axial, points 63
16 to 29
Stiffness to Weight: Bending, points 64
49 to 65
Strength to Weight: Axial, points 170
12 to 16
Strength to Weight: Bending, points 100
19 to 25
Thermal Diffusivity, mm2/s 9.9
0.73 to 3.9
Thermal Shock Resistance, points 74
11 to 53