StarCeram® A Aluminium Oxide (Alumina, Al₂O₃) 99.7% purity



The key benefits of StarCeram® A include: Cheaper than other technical ceramics, high strength, high hardness, good temperature stability, high wear resistance, high corrosion resistance even at high temperatures.



Electrical resistivity ρel

1.00E+12 Ω·m at 20 °C


Density ρ

3.9 g/cm³ at 20 °C


Elastic modulus E

380 GPa at 20 °C

Flexural strength σbend

300 MPa at 20 °C

4-point bending, 40/20mm

Fracture toughness KIC

4.7 MPa·√m at 20 °C

Hardness, Vickers HV

2040 [-] at 20 °C

converted from 20 GPa

Weibull modulus mW

10 [-] at 20 °C



Coefficient of thermal expansion α

7.8E-6 1/K at 20 °C

RT - 1000°C

Max service temperature Tmax

1500 °C

Thermal conductivity λ

25 W/(m·K) at 20 °C

Thermal shock parameter R1 R1

80 °C

Technological properties

Application areas

Air separator wheels, bearing bushes, protection sleeves, crucibles, cylinder linings, dose bushes, pistons, extruder screws, nozzles, slide valves, rotors, seals, sliding rings, stationary seats, wear protection parts, welding rolls, centering pins

This material data has been provided by KYOCERA Fineceramics Precision GmbH.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.