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-----Mil Spec for hard anodizing
OK. I'm new to this Mil Spec for hard anodizing. It looks that type III is the most popular one. Does that mean there are type I and II? If they are, what's the difference among them? Also class means dyed or non-dyed, right? What kind of chemical they use for dyed? Only color is different between dyed or non-dyed? Or any chemical characteristic difference is there?
Steve Leeengineer - Placentia, California, USA
2004
One thing you'll want to do, Steve, is get the spec you are talking about. I think you are referring to
MIL-A-8625 / MIL-PRF-8625
[⇦ this spec on DLA], which is available for free viewing or downloading at http://assist.daps.dla.mil/docimages/0000/58/77/8625F.PD6
Type I and II are types of anodizing, but they are not hard anodizing. Yes, Class refers to dyed or undyed, but as you will see in the spec, Class doesn't really apply to Type III coatings.
Ted Mooney, P.E.
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2004
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