Film Thickness Tolerance

Ask an Expert From: Products Finishing, , from Products Finishing magazine

Posted on: 1/5/2013

Is it possible for products to be powder coated within a range of 80-90 micron thickness. The best I can get is between 70 and 90 micron.

Q. I have a customer who is asking for products to be powder coated within a range of 80-90 micron thickness. The best I can get is between 70 and 90 micron. Is the tolerance they are asking for possible? A range of ±5 micron seems too tight for me. R.S.

A. You will probably not be able to hold that tight of a film thickness tolerance. If you have flat parts that are easy to coat, you can probably hold ±12 micron with great care during application, perfect earth ground and a good powder. If the part has geometry that is harder to coat, the tolerance will definitely be more difficult and film thickness variation will be greater.
Concentrate on consistent application technique, consistent gun-to-target distance and smooth flow. You should be able to establish a consistent range of 70 to 90, but no tighter.
 


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