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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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How to tell if chem film was done
April 26, 2010
I recently ordered some custom machined parts with clear chem film. The vendor supplied documentation stating that they finished the parts to MIL-DTL-5541F Type I Class 3 (clear). A few of the parts, however, have a distinctly different appearance than the rest. They are brighter, shinier, and generally like unfinished aluminum. How can I tell whether these parts were really chem-filmed or not?
The parts will be used on a test fixture in an electronics factory. The conductivity of their surfaces is needed, which drove us to spec chem film instead of anodizing.
Thanks,
Mechanical Engineer - Seattle, Washington
One of the chromate suppliers also sells a spot test kit.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
April 29, 2010
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