plating, anodizing, & finishing Q&As since 1989
MIL-A-8625 Type III the same as AMS 2469
We recently had a job hard anodized and certified to MIL-A-8625 / MIL-PRF-8625 [affil link or DLA] Type III. After the fact, we realized the call-out was for AMS2469 [affil link]. We have been told these are the same. If my cert only gives the mil spec, how can I show/support the equivalent AMS2469 [affil link] spec to the inspector coming to approve these parts (besides my anodizer providing the info)?Jeff Barrett
Unless the two specs were word for word identical, compliance with one would neither insure compliance with the other nor rule it out. So there is probably no reason you can't certify your anodizing as being compatible with both if you wish.
But the same goes for your anodizer. So if are claiming compliance with AMS2469 [affil link] on the strength of a cert. from your anodizer asserting compliance with MIL-A-8625, I don't think that will work; I think you'd need to get your anodizer to claim AMS2469 [affil link] compliance.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
The basic requirements are nearly identical. AMS2469 [affil link] allows slightly more variation in coating thickness. So MIL-A-8625F Type III is more restrictive. A salt spray corrosion test may be specified for AMS2469 [affil link]. MIL-A-8625F Type III has no such requirement. The Taber Abrasion test requirements are the same for both specifications. Unless a salt spray test was called out on the drawing or PO, I say MIL-A-8625F Type III meets or exceeds AMS2469 [affil link].Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
AMENDMENT 1 to MIL-A-8625F added "Type III coatings shall be tested for corrosion resistance only when it is specified that the coating is sealed."
For improved corrosion resistance (but reduced abrasion resistance), sealing of Type III coating can be specified by contract or purchase order. See Paragraph 3.8.2 of MIL-A-8625F.
- Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
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