Chemical Finishes for Aluminum

Chemical Finishes Coatings for aluminum. Color can vary from colorless to golden - iridescent -brown. Materials should conform to Mil - C - 81706. Coatings shall be continuous, free from powdery areas, breaks, scratches, etc.
Spec.	Thickness	Comment
MIL-C-5541E	No Dimensional Change	-
Class 1 A	No Dimensional Change	Class 1A is used as a corrosion preventative film (if unpainted) or to improve adhesion of paint finish systems (if painted).
Class 3	No Dimensional Change	Class 3 is used as a corrosion preventative film for electrical and electronic applications, where low resistance contacts are required.

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