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topic 4690

Alumilite 225 Hardcoat


I've come across some old specifications that call for "Alumilite 225 Hardcoat". I've been able to determine that this is an old Alcoa anodizing specification but I cannot find any specifics on the properties or a current specification or call-out. Is there anywhere that I can get a hold of the old Alcoa specifications so that I can update my old prints to the newest specifications without actually changing the properties of the parts.

David R. Greene
fluid regulators - Painesville, Ohio

First of two simultaneous responses-- (2000)

I've more plenty of info on 225 at work, I'll pass on what I can manage to type up Monday for you. I'm not going to speculate what the makeup is but I know I have a book titled something along the lines of "The Alcoa Anodizing processes" its around 50+ years old, but its the info you want for sure, straight from the source

Matthew Stiltner
plating company - Toledo, Ohio

First of two simultaneous responses-- (2000)

Alumilite 225 is processed in a sulfuric/oxalic acid bath to a thickness of .001". Mil-A-8625 [link is to free spec at Defense Logistics Agency,]F Type III is almost universally accepted as a replacement specification for these old hardcoating processes. The MIL-Spec does not require a certain process but rather sets minimum performance criteria for hardcoatings.

Chris Jurey, Past-President IHAA
Luke Engineering & Mfg. Co. Inc.
supporting advertiser
Wadsworth, Ohio

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Graciela Ibanez
- San Carlos de Bariloche, Argentina

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