Hi-
     
     We have been using low residue fluxes in a cleanable mode in our 
     production for some time now with very good results. We are now just 
     getting into the "no-clean" phase of the implementation with some 
     selected product lines. Think of using these two terms: low residue: a 
     material characteristic of a flux, and no-clean: a soldering process 
     choice. Using the terms that way you will keep more people from 
     becoming confused, especially as things hit the factory floor. As part 
     of our low residue qualification we did some testing to make sure that 
     our low residue materials of choice would be compatible with our 
     existing RMA fluxes. It was a given that both flux types would be on 
     the factory floor during some transition period. I suggest you get 
     ahold of Doug Pauls ([log in to unmask]) - he can give you some good and 
     bad examples of what can happen under different scenarios of mixing 
     low residue and RMA fluxes.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]
     


______________________________ Reply Separator _________________________________
Subject: Subj:  No-clean Repair
Author:  [log in to unmask] at ccmgw1
Date:    11/6/96 11:19 AM


     I have a question concerning repair of a CCAs soldered with 
     no-clean flux (hand soldered and/or wave soldered).  
     
     If you need to repair/rework the CCA, do you use an RMA flux 
     for the repair/rework or no-clean flux? If you use a 
     no-clean flux, how do you know if you have flashed off all 
     the flux that was applied?  Wave soldering pretty much 
     covers the entire bottom side flashing off the no-clean 
     flux, however, a soldering iron may not do that.   
     
     If you use an RMA and clean then it would seem you are 
     defeating the purpose of the no-clean.  Will that cause a 
     problem since the rest of the CCA was soldered using 
     no-clean?
     
     I have heard of cleanable no-cleans, but, what if you are 
     not using a cleanable no-clean.  Could someone straighten me 
     out on this issue?  Thanks!
     
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