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Yellow Iridite

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Looking for specification for yellow Iridite on aluminum.

Edward J. Leszczak
- Atlantic Highlands, New Jersey


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Iridite (with a single 'r') is a Macdermid trade name for (among other things) a qualified product for Mil-C-5541 [link is to spec at TechStreet] chromate conversion coating, Edward. That mil spec may be what you are looking for.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


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How do we look into the RoHS Directive regarding the elimination of the hexavalent chromium linked to the 5541 ?
of course in civilian/computer/telecom equivalent for passivation on aluminium and iron plates?

Dan Yariv-Weisbuch
- Oranit, Israel


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Until recently trivalent chromates generally had little success replacing Hex chrome materials that meet MIL-C-5541 requirements. There is now a group of products that compare favorably with the hex chem films. These should shortly be on the QPL list and meets or exceeds the requirements of MIL-C-5541.

Drew Nosti, CEF
Ladson, South Carolina



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Updating the situation for 2006, Dan, the Navy has licensed four suppliers to offer the TCP process for hex-free chromate conversion coating: Henkel, Luster-On, Metalast and Surtec.

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
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