Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Conformal coating

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#63273

Conformal coating | 10 December, 2010

what is the rootcause for conformal coating dewetting & peeloff

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#63277

Conformal coating | 10 December, 2010

Causes of dewetting in conformal coating. Factors that influence dewetting usually involve non-ionic contamination such as: * Residues from board manufacture including silicone surfactants from solder resist & HASL rinse contamination * Component residues like mold release agents * Silicone oil from adhesives in production. * Soldering process residues * Cleaning bath contamination where rinsing has failed * Operator handling adding contaminants

In the future, consider posting on the 'Production Forum.' You'll get more responses there. This Forum is aimed at people that want to whine about the operation of the site

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 Reflow System

Plasma prior Conformal Coating