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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