Bruce

If you are applying epoxies and other materials after conformal coating,
just be sure that the solvents (if any) are not affecting the coating during
their application and curing.

Otherwise this should simply be regarded as a cosmetic issue.

Cleaning after all these processes is unlikely to be a good option, as the
coating will now be expected to withstand your cleaning process...and
surface cleaning using brushes, swabs etc., are only likely to be moving the
stuff around on the surface rather than removing it.

Hope this helps
--
Regards Graham Naisbitt

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> Hey guys,
>    I have be hit recently on a couple of occasions by the quality folks
> over "foreign material" that is present on CCA's after conformal coating.
> On quite a few boards we install heat sinks after CC and usually use an
> epoxy to aid in heat transfer as well as loctite on the mounting screws.  I
> have been gigged for the residuals (just smears really) whether it is on
> the solder pads or not.  I know that we all are concerned with material
> left over directly on the solder connections, but I am having trouble with
> this one from a logical standpoint.  I mean lets face it, you definitely
> can't test for the presence of ionic contaminants or anything, but I know
> the general impression is the boards should be clean.
>
> I know the simple answer here is to clean up all the residuals (and
> everyone is instructed to do that), but there are times when stuff just
> happens.
>
> Your thoughts
>
> Bruce Stilmack
> GDLS-TO Manufacturing Engineer
> (850) 574-4773
> [log in to unmask]
>
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