Electronics Forum: 1a33 discoloration (2)

Conformal Coating Discoloration

Electronics Forum | Mon Aug 29 16:21:20 EDT 2011 | rjlasko

Greetings...I have a customer that has an assembly that is conformal coated with Humiseal 1A33. This assembly has some components (resistors and FET's) that heated up during operation and has discolored the conformal coating around their location.

Conformal Coating Discoloration

Electronics Forum | Fri Sep 02 16:30:02 EDT 2011 | duso02

Rich That is a standard reaction with Humiseal 1A33, nothing to worry about. Find a board that was coated over year ago and had been heated up at all and it will be an amber color. It does not violate the IPC for discoloration. We have coated boards

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