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Ted Mooney, P.E. RET
Pine Beach, NJ

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Info on Zinc Phosphate Coatings

I have a casting that has been coated with zinc phosphate per TT-C-490 [from DLA] . Should it appear as a thin white residue when properly applied?

Donald Skura

What alloy is this casting? White residue doesn't sound right to me. It certainly shouldn't rub off easily.

Tom Pullizzi
Falls Township, Pennsylvania

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