Also, Ioan, check IPC 7711-7721. It has some really good info on conformal coat removal methods, including a chart by coating type and the corresponding method of removal that is recommended.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Wednesday, October 10, 2012 12:48 PM
To: [log in to unmask]
Subject: Re: [TN] Conformal coating removal

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I totally agree with Dewey on this. I am not sure where Dewey was going with partial coating and stripping but..

..strip and re-coat will be faster and more effective. Having run our own coating service for many years, mucking around with "thousands of boards" is going to cause more trouble than it solves.

For example, you locally remove the coating (or solder through) then you have re-solder the replacement component so how are you going to effectively clean the surrounding area - especially given that the low surface energy of the cleaning solvent will take it everywhere?

Chemically strip - de-solder - replace component and re-solder - clean - re-coat. Job done..

.they even have a new coat to show off when they get back into service. Be careful that your partial new coat doesn't become a fur!

Graham - Beau Brummel - Naisbitt


On 11 Oct 2012, at 01:16, Whittaker, Dewey (EHCOE) wrote:

> I would wait for Doug on this, since he takes his lead from Graham on sartorial splendor and is more used to partially coated affairs. I would strip the whole assembly if possible as the process does an excellent job of prepping the substrate for re-coating.
> Dewey
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
> Sent: Wednesday, October 10, 2012 9:56 AM
> To: [log in to unmask]
> Subject: [TN] Conformal coating removal
>
> Dear Technos,
>
> We need to locally strip the acrylic coating (1B31S) from a few components, on a few thousands of boards. Right now we're using Q-tips to do the rubbing and, besides having to pluck tons of fibers afterwards, we're also going through a lot of Q-tips.
>
> So the question is: is there anything else we can use, that will be more effective, cleaner and more economical?
>
> Thank you,
>
> Ioan Tempea
> Ingénieur principal de fabrication / Senior Manufacturing Engineer 
> [signature002]<http://www.digico.cc/>
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