Stop that Jim. I have Hillman signing me up for all kinds of things, he
does not need assistance.
Like Jim, for much of our coating, we use a 60 mil clearance around
connectors, precisely due to the wicking that Jim describes. Way to easy
to flood the connector. Machine application is not that much difference
beween you get much more wicking that way, especially if you spray
(thinned material wicks more).
Now, this clearance also creates potential failure sites in humidity. What
I would recommend around connectors is to find a no-flow sealant to
permanently seal the base of the connectors, then coat up to that sealant.
That way you get a continous protective film. Same consideration if you
have components you need to seal off.
Doug Pauls
Jim Carlson <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
01/19/2011 03:24 PM
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Re: [TN] Conformal Coat vs. Masking
Jack,
Our normal manual clearance is .06", to prevent wicking on any leaded
type of component. If you have small isolated areas to mask, this will
work. But if it requires a lot of different components/areas, you will
be driving touch time and intricate masking. Perhaps Doug Pauls can
provide adequate clearance for automated methods.
Jim Carlson
Quality/Configuration Manager
L-3 Communications
Applied Signal & Image Technology
443-457-1111 Ext. 238
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, January 19, 2011 4:10 PM
To: [log in to unmask]
Subject: [TN] Conformal Coat vs. Masking
Does anyone know a sensible guideline for how much space to leave
between
conformal coated areas and other areas that should NOT be coated?
We have some high voltage areas of circuitry that need to be coated,
near other
connectors and mounting holes that will not be coated. The problem is,
the
assembler is asking for far more "isolation" than the engineers!
(might it be a different clearance for manual vs. in-line?)
Seems like this would be common knowledge, but I just can't find it
anywhere...
thanks,
Jack
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