Electronics Forum: conformal and coating and solder and mask (Page 1 of 3)

Solder Balls and conformal coating

Electronics Forum | Fri Apr 05 15:24:14 EDT 2019 | sever_83

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?

Solder Balls and conformal coating

Electronics Forum | Fri Apr 05 16:31:55 EDT 2019 | slthomas

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?

Solder Balls and conformal coating

Electronics Forum | Mon Apr 08 14:16:29 EDT 2019 | sever_83

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

Conformal coating mask dots and halos

Electronics Forum | Fri Feb 26 12:01:08 EST 2010 | jdumont

Hey its probably the silicone adhesive

Conformal coating mask dots and halos

Electronics Forum | Mon Mar 01 07:24:55 EST 2010 | jdumont

No problem just busting, trying to keep the mood light! Cheers

Conformal coating mask dots and halos

Electronics Forum | Fri Feb 26 10:42:56 EST 2010 | mleber

Your masking dots are a silicone adhesive. Contact the supplier and tell them you need an acrylic adhesive on the same dots. Normally same cost and lead time.

Conformal coating mask dots and halos

Electronics Forum | Thu Feb 25 10:30:21 EST 2010 | davef

It sounds like your poly dots are secreting something that affects coating thickness. Is this a function of the adhesive used by poly dot supplier?

Conformal coating mask dots and halos

Electronics Forum | Fri Feb 26 10:34:03 EST 2010 | kpm135

If I had to guess I'd say they're using a silicone based adhesive.

Conformal coating mask dots and halos

Electronics Forum | Fri Feb 26 15:41:19 EST 2010 | kpm135

sorry jdumont I didn't see your post until after I posted mine for some reason. If I had seen it first I wouldn't have posted because yours covered it.

Conformal coating mask dots and halos

Electronics Forum | Mon Mar 01 09:17:56 EST 2010 | duso02

Hey....I think it might be the silicone adhesive! LOL Yeah, that'll do it. We use simple Shercon paper dots. Work like a charm. No evidence of "de-wetting".

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