It's certainly "do-able".  Conformal coating adhesion testing was done as part 
of the "Evaluation of Low Residue Sodeirng for Military and Commercial 
Applications:  A Report from the Low Residue Sodlering Task Force", report 
published by Sandia National Labs in June 1995.   I would note however that the 
rankings did differ from process to process and it really depends on 

        YOUR process (ie. flux, how much you add, solder process, etc)
        YOUR PWB incoming cleanliness (CRITICAL if you really are doing "no     
                     clean)
        YOUR end item use environment (does coating just have to "cure and      
                     stick" or do you do humidity exposure type testing??)

Jim Maguire
Senior Principal Engineer
Boeing Defense & Space Group
PO Box 3999 M/S 3W-97
Seattle, WA  98124-2499
Phone 206-657-9063
FAX    206-657-8903
Email:  [log in to unmask]
______________________________ Reply Separator _________________________________
Subject: ASSY: Conformal Coating NoClean PWB's
Author:  [log in to unmask] at esdigate
Date:    10/25/96 7:28 AM


We are anticipating assembling a large quantity of pwb's which will require 
a polyurethane conformal coating.  We would prefer to use a no-clean solder 
process but feel the residues will not permit the coating to adhere.  Is 
anyone aware of products or procedures which would allow a pwb, which has 
been assembled with a no-clean process (sans cleaning), to be conformally 
coated?
Anyone have any prior experience with this issue. 
Thanks for your time.
Joe Wergers, Project Engineer
Fawn Industries, Inc.
Box 369
Elm City, NC 27822
Web Site: www.fawn-ind.com
Email: [log in to unmask]
     
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