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How to detect whether powder coating is on GI vs CRCA?



Q. During assembly we found a mix-up issue. Please give a visual detection standard or is there any instrument for the same.

Abhijeet B. Berad
- Maharashtra India
September 13, 2022



Defelsko Positector combo magnetic & eddy-current coating thickness tester

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A. Hi Abhijeet. If there was a way to detect visually, buyers would insist on the process being improved so there wasn't :-)

A simple magnetic pull tester can reveal the combined thickness of non-magnetic galvanized and powder coated finishes, so if the galvanizing is quite thick and the powder coating is quite thin, perhaps it can differentiate. Beyond that you would need a more expensive non-destructive test such as x-ray fluorescence or beta backscatter.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


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