Alumina (Al2O3) – CeramAlox™

Alumina is the more common name of Aluminum Oxide (Al2O3). It is a hard-wearing technical ceramic offering an excellent combination of both mechanical and electrical properties. It is well-suited for a wide range of industrial applications.


Alumina features high hardness, wear resistance, low erosion levels, high temperature resistance, corrosion resistance, and bio-inertness. Its high temperature stability and thermal conductivity make it particularly suitable for high temperature applications such as thermocouple protection in high temperature measurement. Precision Ceramics offers a comprehensive range of advanced ceramic tubes and insulators for this purpose.


  • Excellent electrical insulation properties
  • High hardness and mechanical strength
  • Wear and abrasion resistant
  • High thermal conductivity and thermal shock resistance
  • Low density
  • Resistant to strong acid and alkali attack at high temperatures
  • Transparent to microwave radio frequencies
  • High compressive and dielectric strength
  • Very specific thermal conductive and thermal expansion rate


Alumina is a very hard ceramic that is excellent at resisting abrasion and is ideal for wear-resistant inserts or products. It is commonly used as a high temperature electrical insulator, particularly the higher purity grades which offer better resistivity. It also offers good resistance to strong acids and alkalis at elevated temperatures, which makes it ideal for applications where resistance to corrosive substances is required. Some common applications include:

  • Electronic components & substrates
  • High temperature electrical insulators
  • High voltage insulators
  • Laser tubes
  • Machine components
  • Mechanical seals
  • Precision shafts and axles in high wear environments
  • Roller and ball bearings
  • Seal rings
  • Semiconductor parts
  • Shot blast nozzles
  • Thermocouple tubes
  • Tap plates
  • Valve seats
  • Wear components
  • Wire and thread guides
  • Ballistic Armor

Alumina Material Properties