ESD-Safe Alumina
ESD alumina is a grade of alumina. The graph bars on the material properties cards below compare ESD alumina to other oxide-based engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Compressive (Crushing) Strength
2020 MPa 290 x 103 psi
Elastic (Young's, Tensile) Modulus
370 GPa 54 x 106 psi
Flexural Strength
300 MPa 44 x 103 psi
Fracture Toughness
4.0 MPa-m1/2 3.6 x 103 psi-in1/2
Poisson's Ratio
0.22
Thermal Properties
Maximum Temperature: Mechanical
650 °C 1200 °F
Maximum Thermal Shock
200 °C 390 °F
Melting Onset (Solidus)
2040 °C 3700 °F
Thermal Conductivity
25 W/m-K 14 BTU/h-ft-°F
Thermal Expansion
8.0 µm/m-K
Other Material Properties
Density
3.9 g/cm3 240 lb/ft3
Dielectric Constant (Relative Permittivity) At 1 MHz
9.6
Electrical Dissipation At 1 MHz
0.0010
Electrical Resistivity Order of Magnitude
6.2 10x Ω-m
Common Calculations
Stiffness to Weight: Axial
53 points
Stiffness to Weight: Bending
62 points
Strength to Weight: Axial
14 to 23 points
Strength to Weight: Bending
19 to 28 points
Thermal Diffusivity
3.7 to 10 mm2/s
Thermal Shock Resistance
4.9 to 14 points
Followup Questions
Further Reading
Ceramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford and Robert H. Doremus (editors), 2008
Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012
Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005