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Us28 Anodize Aluminum

Q. We are an aluminum anodizing and steel finishing company that runs into many military and aerospace specifications. I recently had a customer inquire about what he called spec. US28 anodized aluminum. I've searched the internet and have found very little information other than it is a natural anodized finish and it seems to apply to hardware. Can anyone elaborate? I appreciate your help.

Derek Shepherd
- Dayton, Ohio, U.S.A.
August 2, 2012
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