Bernex™ 29 Al2O3

Aluminum oxide coating for high temperature forming applications

Bernex™ 29 Al2O3 is a multi-layered CVD coating engineered to be able to cope with the aggressive conditions present in high temperature forming applications. Bernex™ 29 Al2O3 exhibits excellent thermal stability, chemical inertness, and high wear resistance, which makes it the leading solution for hot extrusion applications for both ferrous and non-ferrous alloys. Additionally, the ideal solution for open tolerance tools used in aluminum casting applications where sticking of aluminum is the primary cause of downtime. Bernex™ 29 is deposited at 1000 °C. Therefore it is only recommended for tool materials compatible with the CVD process. Dimensional change will occur on tool steel materials coated with Bernex™ 29, so sufficient dimensional tolerances are required to accommodate the expected dimensional change.

  • High thermal stability
  • Low adhesive wear and-or sticking problems
  • Medium impact fatigue resistance

Technical data



α Al2O3, κ Al2O3

Coating thickness

8 - 16 μm

Service Temp.

1000 °C

Deposition Temp.

1000 °C

Hardness HV 0.05


Deposition method


Friction vs. steel, dry

< 0.2