PTFE impregnation of aluminum anodizing
We are also looking for a PTFE-related process which complies to Mil-A-63576 [link by ed. to spec at TechStreet]A (AR) Type I - the impregnation process on unsealed anodic coatings.
Please advise?Alex Chong
April , 2009
Hi, Alex. This specification is for a PTFE coating/impregnation on unsealed hardcoat anodizing. It was cancelled in 1998 and last revised in 1985, so it's getting rather dated.
But I don't see any Qualified Products List associated with it, which I believe would mean (unless it's there and I missed it), that you can use anything that works and allows the parts to comply with the rest of the specification.
Some of the experienced anodizers here have pointed out [see letters 1819] that PTFE particles are larger than the anodizing pores, such that it really isn't an "impregnation" process; further, the spec itself speaks of coating the "asperities" rather than impregnating the cavities.
A coating material was suggested in those referenced letters, and hopefully a reader will suggest additional alternatives. Good luck!
Ted Mooney, P.E.
Pine Beach, New Jersey
Striving to live "Aloha"
November 25, 2009
Let in my knowledge, PTFE Impegration on anodized surface is a only one kind of sealing process which fills the cracks devloped during the anodizing process and gives the smooth surface with lubricity.
- Ahmedabad,Gujarat, India
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