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Need info re: Changes is RMS Values after Hardcoat Anodize

I am looking for data regarding Hardcoating Aluminum & the change in RMS values that should be expected after finishing.

David A. Kraft
- Long Island City, New York

See Hard Anodizing of Aircraft Fuel Metering Components, Wiesner and Meers, 45th Annual Technical Proceedings, AES, 1958, for Martin Hard Coat reference which states that for cast alloys like 355 and 356, silicon particles cause irregularities, making it difficult to obtain 10 RMS.

Tom Pullizzi
Falls Township, Pennsylvania

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