Electronics Forum: conform and coating (Page 1 of 109)

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?

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 21 17:22:29 EDT 2005 | davef

We prefer epoxy.

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 21 12:35:15 EDT 2005 | jdumont

Well that doesnt sound very promising. What im going to do is make sure these two boards I just coated (with the RTV already cured) will be used in house only. In the future we will do any conformal coating operations before potting with whatever mat

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 21 10:44:35 EDT 2005 | jdumont

Morning all. So today I have been tasked with conformally coating a few of our first run PCBs for a new product line. The problem is that they have already had all the larger caps potted with RTV. Are there any problems with spraying the CC over the

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?

Mixing conformal coating and RTV

Electronics Forum | Fri Apr 22 10:12:14 EDT 2005 | davef

Common RTV does out-gas causing corrosion. NASA allows use of non/low-out-gassing RTV. Try the following companies: * Ablestik Electronic: Materials, 20021 Susana Road, Rancho Dominguez, California 90221 U.S.A., 310-764.4600, F 310-764-2545 * Arlon

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 28 11:14:27 EDT 2005 | bbarr

If you apply the RTV after coating, what happens to bond strength since you are now bonding to the coating and not the board? Will the caps still survive vibration and shock? I specify applying RTV before coating for this reason. Am I correct? I als

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

Mixing conformal coating and RTV

Electronics Forum | Thu Apr 21 11:43:03 EDT 2005 | davef

We understand the problem of trying to coat over RTV. We have seen the same problem with acrylic and urethane coatings not wanting to stick to RTV. Some acrylics seem to be worse than urethane. Since this is a new product, may be you could pot your

Conformal coating mask dots and halos

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

Hey its probably the silicone adhesive

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