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March 2013

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From:
lee Hitchens <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, lee Hitchens <[log in to unmask]>
Date:
Tue, 26 Mar 2013 16:39:45 +0000
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Can I also ask a question. What is the purpose of baking a PCB before
coating, assuming that the cleaning process drying section is adequate? I
have never really got a good answer to this?

Best Regards

Lee Hitchens
Technical Director

SCH Technologies is a Division of SCH Services Limited
Mob: +44 (0) 7862 25 33 21 www.conformalcoating.co.uk

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Fox, Ian
Sent: 26 March 2013 16:17
To: [log in to unmask]
Subject: Re: [TN] Conformal Coat and Board Edges

No we don't. Since the purpose of the coating is not to prevent moisture
ingress into the board (we all know that happens), but really to prevent
issues with condensation, and since there likely will be no exposed tracks
on the edge, there's no point. We typically have a ground/thermal strip
around the edge of the card anyway so the masking may sometimes cover, or
partially cover the edge. I couldn't tell you how many millions of on wing
hours our assemblies have accumulated over the past 30+ years, but we've
never had an issue in service as a result of uncoated edges, nor in the
umpteen unit qualifications we've carried out. In fact if you carry out
weight gain measurements with high (85%+) humidity exposure the laminate is
typically saturated after about 4 days and we always run the 10 day tropical
exposure test

Regards

Ian Fox
Lead Materials and process Engineer
 
Aero Engine Controls
York Road, Hall Green, Birmingham B28 8LN | Tel: +44 (0)121 607 3763 | Fax:
+44 (0)121 607 3975
Email: [log in to unmask] | Web: www.aeroenginecontrols.com
 
Aero Engine Controls is part of the Rolls-Royce Group


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: 26 March 2013 15:43
To: [log in to unmask]
Subject: [TN] Conformal Coat and Board Edges

OK, the conformal coat question of the day:

Do you conformally coat the edges of a printed circuit assembly?  Why or why
not?

OK, that is two questions, or perhaps a half fractional question.....

Doug Pauls


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