By far the best protection of any kind of coating
Very uniform thickness, even over sharp edges and points
The vacuum/plasma reduces residual surface contamination, especially
hygroscopic volatiles
A bugger for rework
Expensive
GREAT!
Brian
Reuven ROKAH wrote:
> Hi Perylene users,
>
> Can you share with your experience and inform the + and - of this process?
>
> I have last week visited one of the users site and it seems promising.
>
> I have long experience with spraying systems and not vacuum systems.
>
> Best Regards
>
> Reuven
>
>
>
>
> Graham Naisbitt
> <Graham.Naisbitt@CON To: [log in to unmask]
> COAT.CO.UK> cc:
> Sent by: TechNet Subject: Re: [TN] Foreign material on top of the conformal coating
> <[log in to unmask]>
>
>
> 12/12/2003 18:02
> Please respond to
> "TechNet E-Mail
> Forum."; Please
> respond to Graham
> Naisbitt
>
>
>
>
>
> 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
>
> [log in to unmask]
>
> Cell: 079 6858 2121
> Office: +44 (0)1252 813706
>
> Concoat Limited - Engineering Reliability in Electronics
>
> NEW - HumiSeal 1H2O Bov Aerosol - NEW
>
> Web: www.concoat.co.uk and www.concoatsystems.com
>
>
>
>>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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