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July 2008

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Subject:
From:
"Douglas O. Pauls" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 22 Jul 2008 11:50:50 -0500
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Phil,
That's not a cleaner, that's a stripper.  n-methyl pyrrolidone (NMP) is 
the active stripper in many of the "environmentally friendly" coating 
strippers.  Glycol methyl ethers too.

Doug Pauls




Phil Nutting <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
07/22/2008 11:24 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Phil Nutting <[log in to unmask]>


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Subject
Re: [TN] Washing dirty conformally coated boards






Brian,

From the manufacturer's MSDS for their recommended immersion cleaner:

SECTION 2: COMPOSITION/INFORMATION ON INGREDIENTS
Chemical Name                          CAS No.      Wt. % Range
3-methoxy-3-methyl Butanol      56539-66-3   25.0-75.0
Dipropylene glycol methyl ether  34590-94-8   25.0-75.0
N-Methyl pyrrolidone                872-50-4       5.0-25.0
2-Butoxy ethanol                       111-76-2       0.1-10.0

Phil

-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]]
Sent: Tuesday, July 22, 2008 12:00 PM
To: TechNet E-Mail Forum; Phil Nutting
Subject: Re: [TN] Washing dirty conformally coated boards

I would remove the coating with a mild solvent, such as a HCFC/HFC/HFE
blend, preferably in a vapour phase machine and recoat.

Brian

Phil Nutting wrote:
> Good morning,
>
> We have some circuit boards that we coat with Chemtronics Konform AR, 
that when returned from the field need to be washed to remove the 
graphite/carbon and brass dust (it won't blow off).   Washing and rinsing 
at temperature tends to peel the conformal coating off.  The currently 
process is hand washing and rinsing, but it is a totally uncontrolled 
process.
>
> I'm looking for recommendations for a more controlled process that is 
less likely to remove the coating.  I just want to get the dusty stuff off 
the board.  It looks I'm going to have to create a machine or controlled 
process the works at room temperature.
>
> Phil
>
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Note: All the information contained in this e-mail and its attachments is 
proprietary to Kaiser Systems, Inc. and it may not be reproduced without 
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in error, please immediately return it to sender and delete the copy you 
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