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July 2008

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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 10:26:23 -0500
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Good morning Phil. 

I don't think you're going to find one.  Unless the Konform is a harder 
more durable acrylic coating than the Humiseal 1B31 we use, I think you 
will find the material to be embedded in the coating and washing will not 
bring it out.  The fact that you can't blow it off indicates that.  We 
have always had to globally strip the acrylic coating to get the "schmutz" 
off, then recoat the board.

If I had to try, it would be with a very mild detergent solution such a 
Liquinox.

Doug Pauls




Phil Nutting <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
07/22/2008 10:18 AM
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TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Phil Nutting <[log in to unmask]>


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Subject
[TN] Washing dirty conformally coated boards






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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