Hi David:
     
     Could you be getting a turbulent flow/disruption in the Nordson 
     nozzle? What about a contaminate on the PWA that is reacting with the 
     postcoat to form bubbles?
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: Bubbles in Conformal Coating
Author:  [log in to unmask] at ccmgw1
Date:    7/26/96 11:52 AM


     Has anyone ever experienced a problem with bubbles in conformal 
     coating when using an acrylic coating (CONAP 1171) applied with a 
     Nordson Select Coat system?  The bubbles appear instantly as the 
     coating is applied.  The result is a non-conforming defect per 
     IPC-A-610 section 7.1.2.  Thank you.
     
     
     David Bruni
     Manufacturing Engineer
     MSA
     Instrument Division
     (412) 776-8848
     
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