All No clean really means is no need to clean because the residues are believed
safe and look OK..
[RMA fluxes are believed safe but look messy.]   
However most people equate no clean with low residue and give themselves a hard
time as a result. 
A number of companies can supply you with repair fluxes which are noncorrosive,
not dependent on "burn off" for safety and can be removed if required. These
products are effectively solderless solderpastes.
They do have slightly higher residues, but whether or not these are acceptable
to you you will have to try - there is no way of technically assessing aesthetic
appearance.
If you can't locate a suitable supplier feel free to come back to me and I can
pass on a US companiy.

Mike Fenner
BSP UK.
[log in to unmask]
-----------------------------------------------

Subject: Subj:  No-clean Repair
Author:  [log in to unmask] at internet
Date:    11/6/96 1:37 PM


     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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