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| Date: | Tue, 22 Jul 2008 14:56:07 EDT |
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Phil
I have been effectively cleaning diesel fuel carbon dust and oils off a
urethane coated assemblies with a saponifier (3% heated to 125 C) cleaning in a
low pressure (25 psi flood nozzle system) in a Tsunami batch cleaning system
with minimal or no damage to the coating surface. We have used different MEA
based cleaners very effectively at lower concentrations. Call me off line if
you are interested in more details.
Terry Munson
Foresite
765-457-8095
In a message dated 7/22/2008 12:26:27 P.M. Eastern Daylight Time,
[log in to unmask] writes:
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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