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Ask the Expert Question-and-Answer Archive by Ron Joseph March, 2006 Class (Classification) of Finish Quality Q. Is there any written explanation to the different finish qualities that powder coaters achieve? As an example powder coaters refer to class "A" , "B", "C" finishes. We have a customer that the print calls for a class "B" finish which in our view as a custom coater we have achieved, but they say we need to be 3-8 mils thick for this, but I found out that the thickness is more related to a later assembly issue than a appearance issue. I"m just looking for some type of documentation to show the differences of powder coaters views on the different classes. A. To the best of my knowledge there is no formal specification that defines
Class A, B or C. Usually, a finish quality is based on the number and types
of defects that can be seen from a specified distance. In my opinion, you and
your customer should have agreed on your mutual understanding of Class B before
commencing the work. Sometimes, a color chip is made as a standard before the
contract commences so that you can use it later for determining what is acceptable
and what is a reject. Best wishes, Ron Joseph
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