This?
http://www.youtube.com/watch?v=ErQF4RltjOI
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Tuesday, July 22, 2008 3:05 PM
To: [log in to unmask]
Subject: Re: [TN] Washing dirty conformally coated boards
YES
----- Original Message -----
From: "Phil Nutting" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 22, 2008 12:51 PM
Subject: Re: [TN] Washing dirty conformally coated boards
Inge,
What was your "secret" ingredient?
Phil
-----Original Message-----
From: Inge [mailto:[log in to unmask]]
Sent: Tuesday, July 22, 2008 3:44 PM
To: TechNet E-Mail Forum; Phil Nutting
Subject: Re: [TN] Washing dirty conformally coated boards
Phil,
have you ever seen electronics from the war places like Iraq and
Agfanistan?
I got the task to create a cleaning procedure to save hundreds of
advanced
boards which were so contaminated with sand, that you could just see the
contours of the components! They were 1B31 coated. First, I poured
desert
sand on fresh boards and put them in a +60 Centigrade oven for a week.
As I
suspected, the sand particles adhered more and more to the softened
coating.
It seemed impossible to remove them. But I found, that a suitable
tenside
added to ordinary tap water loosened the particles that were on their
way to
be imbedded in the coating. So, we simply used a popular cleaner that is
used in many kitchens, used warm water and a brush, and could wipe off
95%
of the sand with a gentle brushing. Sometimes you are lucky with very
simple
methods.
Your combination of graphite and brass dust is really a bad situation,
worst
case, as I can see, but my home made method may be worth trying. The
brushes
we used were ESD safe, may not be necessary, but I insisted to buy such.
The
choice of brush depends on what you got on the boards.
http://www.gordonbrush.com/esd/di_900.htm
Inge
----- Original Message -----
From: "Phil Nutting" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, July 22, 2008 8:18 AM
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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