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Beryllia (Beryllium Oxide, BeO)

Beryllia is an oxide-based engineering ceramic. It has a fairly high heat capacity and the highest thermal conductivity among oxide-based engineering ceramics. The graph bars on the material properties cards below compare beryllia 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

1650 MPa 240 x 103 psi

Elastic (Young's, Tensile) Modulus

350 GPa 50 x 106 psi

Flexural Strength

240 MPa 35 x 103 psi

Poisson's Ratio


Shear Modulus

180 GPa 25 x 106 psi

Tensile Strength: Ultimate (UTS)

140 MPa 20 x 103 psi

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

11 kV/mm 0.45 V/mil

Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

13 10x Ω-m

Other Material Properties


2.9 g/cm3 180 lb/ft3

Maximum Temperature: Mechanical

1750 °C 3180 °F

Specific Heat Capacity

1050 J/kg-K 0.25 BTU/lb-°F

Thermal Conductivity

270 W/m-K 150 BTU/h-ft-°F

Thermal Expansion

8.0 µm/m-K

Common Calculations

Stiffness to Weight: Axial

67 points

Stiffness to Weight: Bending

82 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

89 mm2/s

Thermal Shock Resistance

3.6 points

Followup Questions

Further Reading

ASTM C242: Standard Terminology of Ceramic Whitewares and Related Products

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015