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Al2O3 Aluminum Oxide

Technical alumina high performance ceramics

Special Properties

  • Purity of 99,7 %
  • Outstanding temperature resistance
  • Very good electrical insulation characteristics
  • Extremely strong dielectric strength
  • Very good mechanical strength
  • Exceptionally good tribological properties
  • Can be processed with conventional CNC-machines with abrasive tools
  • Low dissipation factor
  • Good metallizability
  • Very hard material

Typical Applications

  • Heat resitant ceramic components
  • Electrical performance insulators
  • Space Applications
  • Dielectric for capacitors
  • Welding nozzles
  • Ceramic Bushings


Al2O3, aluminum oxide characteristics

Al2O3 alumina is a white, opaque, high performance ceramic with exceptional physical characteristics. It is extremely temperature resistant and has a very good mechanical strength. Aluminum oxide offers an extraordinarily good electrical insulation, has a low dissipation factor, and a great dielectric strength. These qualities enable electrical applications at high voltage.

But also the mechanical characteristics of Al2O3 ceramic material are a noteworthy feature. Aluminum oxide materials are often used when components must withstand strong mechanical wear. They offer a very good wear resistance. Due to the excellent tribologicals, much longer life times of workpieces can be achieved with Al2O3.

Since aluminum oxide materials can be ground using conventional abrasive tools on conventional CNC-machines, complex workpieces based on this special ceramic material can be manufactured. The potential complexity of the components manufactured of aluminum oxide is limited only by the technical limits of the machinery used, so even very complex precision workpieces can be produced of Al2O3 aluminum oxide. To request further specific information about our aluminum oxide materials, please use our information request.


To request your individual component made of Al2O3 aluminum oxide, please use our request form by clicking on the button below:


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Raw Density

  • 3,75 - 3,94 g/cm3


  • 99,7 % Al2O3

Type classified by DIN EN 60672

  • C799

Coefficient of Expansion

  • 78 x 10-7 / °C (20-700 °C)
  • 86 x 10-7 / °C (20 - 1000 °C)


  • Max. operating temperature under
    mechanical load: approx. 1700 °C
  • Good temperature shock resistance
  • Specific heat capacity: 990 J kg-1 K-1
    (20-100 °C)


  • Modulus of elasticity : 300-380 GPa
  • Mohs hardness : 9
  • Modulus of rupture : 300 Gpa (20 °, 3-Point)


  • Electric strength: 17 kV/mm (IEC 672-2)
  • Specific DC-resistance: 1014 Ω cm (20 °C)

Other specifications

  • Water absorption capacity: ≤ 0,2 %
  • Leak rate: 10-10 hPa dm3 s-1 (20 °C)


All given details and specifications given here are mean reference values and are not guaranteed. In addition, please consider our "Notes on technical specifications"