Ceramic Material Properties

Alumina datasheets typically leave tensile strength and yield strength blank, which frustrates engineers used to metal specs. The reason is not a gap in the data. It is that tensile testing is unreliable on brittle ceramics and that yield strength is a metal concept that does not apply to a material with no plastic deformation

Alumina’s room-temperature thermal conductivity runs from 10 to 22 W/m·K across the six commercial purity grades, rising with Al2O3 content. Thermal conductivity drops sharply as temperature increases, roughly halving by 500 °C, which is the single most important factor that datasheet-driven designs get wrong. The room-temperature values on this page are from our internal quality

Alumina’s Young’s modulus falls between roughly 280 and 400 GPa across commercial purity grades, rising with Al2O3 content and approaching values close to single-crystal sapphire, which is anisotropic and ranges from about 400 to 460 GPa depending on crystal orientation. The values on this page are the industry-typical figures cross-referenced from published supplier data sheets

The density of alumina ceramics ranges from 3.62 to 3.95 g/cm³ across the six commercial purity grades (95%, 97%, 99%, 99.5%, 99.7%, and 99.99%), all approaching the theoretical density of pure Al2O3 at 3.98 g/cm³. Density is the property engineers check first when comparing grades, because every other mechanical, thermal, and electrical figure in the

The six commercial alumina grades we produce (95%, 97%, 99%, 99.5%, 99.7%, and 99.99%) span a wide performance range. Density runs from 3.62 to 3.95 g/cm³, Vickers hardness HV 1410 to 1660, bending strength 292 to 392 MPa, and dielectric strength 17.84 to 24.38 kV/mm. Every value below is grade-specific, drawn from our internal quality