Reuven,
I assume that conventional coatings did not do the job? Maybe this was an
application issue?
There is no question that Paralene is the ultimate coating - but as with all
other coatings, it is not without its own drawbacks:
It is a batch process
It is more expensive overall, than most conventional coatings
It requires a clean surface
It is not easily repaired, and conventional coatings are normally used to
carry out the repair
Masking has to be 100% perfect - don't forget through hole via's adjacent to
connectors, trimmers etc.
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
> 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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