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]>
To
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cc
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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