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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Balls and conformal coating

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#82303

Solder Balls and conformal coating | 5 April, 2019

What can cause solder balls to appear after conformal coating? Using Dymax 9-20557, light curing for 1.5 mins. Can too much heat from light cure cause solder balls?

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#82304

Solder Balls and conformal coating | 5 April, 2019

Never heard of such a thing. Are you sure the coating isn't just making the solder balls more prominent?

Where are the "new" solder balls appearing after coating?

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#82316

Solder Balls and conformal coating | 8 April, 2019

We've never heard of seen of such a thing either. We tried a clean sample board and applied con coat. Same process through out and we saw nothing. After speaking with the original operators who was curing the boards he had left the boards much longer than required. So we experimented again and we noticed solder balls appearing and some components moving as well. This was with the PCB under the light for more than 5 mins.(which is unacceptable for this application) At least we were able to verify this was operator fault and corrected the issue.

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