Iridite NCP is a non-chromium passivate for aluminium. It has been used for a number of years by many throughout the industry. Iridite NCP is designed to be a replacement for traditional chromate conversion coatings.

Our testing has indicated that Iridite NCP is not suitable for all commonly used materials, specifications and use-cases. We also offer Surtec 650V, which may be more suitable in some cases. Please contact us for advice about which will be most suited to your application.


  • Provides increased corrosion resistance while still preserving electrical conductivity
  • Provides a base for painting and allows bonding.

Specifications Offered

  • Def Stan 03-38

We can work to many other specifications, but the above are our most popular. Please contact us with your requirements.

RoHS and REACH Compliance

Iridite NCP is RoHS compliant. Unlike some other treatments on the market, Iridite NCP contains no chromium at all. Iridite NCP does not contain SVHCs above the threshold and will not be restricted by REACh.