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December 2003

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 15 Dec 2003 05:35:19 -0800
Content-Type:
text/plain
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text/plain (165 lines)
        Reiven:
        Pro:  Coats everything and seals it.

        Con:  Slow process,   lots of equipment upkeep,

        Some board usage needs this type of CC, most do not.
        Regards,
        Ramon


> -----Original Message-----
> From: TechNet [SMTP:[log in to unmask]] On Behalf Of Reuven ROKAH
> Sent: Sunday, December 14, 2003 2:54 AM
> To:   [log in to unmask]
> Subject:      [TN] Conformal coating - PARYLENE DIMER DPX-C
>
> 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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