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Alumina (Aluminum Oxide, Al2O3)
Material Properties
Compressive (Crushing) Strength: 1700 to 2900 MPa (247 to 421 x 103 psi)
Density: 3.42 to 4.16 g/cm3 (214 to 260 lb/ft3)
Dielectric Constant (Relative Permittivity): 8.2 to 12.5
Dielectric Strength (Breakdown Potential): 9 to 17 kV/mm (0.4 to 0.7 V/mil)
Elastic (Young's, Tensile) Modulus: 200 to 390 GPa (29 to 57 x 106 psi)
Electrical Resistivity Order of Magnitude: 4 to 12 10x Ω-m
Flexural Strength: 200 to 1000 MPa (29 to 145 x 103 psi)
Fracture Toughness: 3.0 to 13 MPa-m1/2
Melting Onset (Solidus): 2040 °C (3700 °F)
Specific Heat Capacity: 880 to 900 J/kg-K
Strength to Weight Ratio: 32 to 130 kN-m/kg
Tensile Strength: Ultimate (UTS): 120 to 480 MPa (17 to 70 x 103 psi)
Thermal Conductivity: 10 to 35 W/m-K
Thermal Diffusivity: 3 to 11
Thermal Expansion: 5 to 8.4 µm/m-K
See Also
ASTM D 2442: Standard Specification for Alumina Ceramics for Electrical and Electronic Applications
Ceramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford and Robert H. Doremus (editors), 2008
IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

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