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topic 10556

Iridite finish spec for aluminum


My company has inherited a design including aluminum parts which are specified to be finished according to "IRIDITE 14-2". The shop that is now making the parts doesn't recognize this spec, and I have been unable to find it on the web or in any of the reference books I looked at.

Can someone enlighten me as to what this spec is?

Thomas McCarty
- Lake Forest, California, USA

First of two simultaneous responses 2001

Iridite is a Macdermid trade name for chromate conversion coatings, Thomas. Note that it has a single 'r', which is probably why you had difficulty with your search.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

Second of two simultaneous responses 2001


14-2 is not a spec it is a product, originally from Allied Kelite. It is a gold chromate on Aluminum. The spec is Mil-C-5541 [link is to free spec at Defense Logistics Agency,]. And 14-2 meets it . There are non-chrome substitutes for 14-2 such as Sanchem 3500.

drew nosti
Drew Nosti, CEF
supporting advertiser
Ladson, South Carolina

First of two simultaneous responses 2001

Iridite 14-2 is a trade name for a chem film process like Alodine 1200.

What you could do is to change the spec to AMS C5541 [withdrawn / link is to spec at TechStreet] class 1A (replaced Mil-C-5541 class 1A).

This will get you from a trade name to an internationally recognised standard.

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England

Second of two simultaneous responses2001

Iridite 14-2 is a product.

There are many products used for chromate conversion aka chem film aka chemical conversion coatings.

Iridite 14-2 is just one of many products used to produce these coatings.

This happens to be the product we use here.

David A. Kraft
- Long Island City, New York

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