Description
Castrol Rustilo ™ AS 20 is an environmentally responsible passivation product for use in protecting galvanised
steel tubes and pipes against white rust. It is water based, and forms a protective covalently bonded film on the
metal surface.
Application
Rustilo AS 20 is used as a replacement for hexavalent chromates, oil based rust preventives and also polymer
films.
It is designed so that it can be painted over, therefore is useful for tube manufacturers who then go onto a powder
coating process.
The final film left on the metallic coating surface is approximately 300 nm thick and is colorless. It is suitable to
be welded and is environmentally responsible being compliant with the latest legislations that restrict the use of
chromium (VI) coatings, such as the EU-Directive 2000/53 / EC ("End of Life Vehicles Directive", ELV).
Advantages
Chromate free - non-carcinogenic alternative to chromium (VI) currently in use
Easily applied using the same equipment as required for chromates
Corrosion protection equivalent to chromates in most applications
Can be painted over
Does not cause spearing of the tubes in bundles
Can be ink jetted over
Tubes coated with Rustilo AS 20 can be welded