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June 1998

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Tue, 2 Jun 1998 00:49:54 -0600
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Steven,

We had the same problem a couple of years ago where part 
markings were coming off of glass bodied parts.  It happened 
during saponified aqueous, and the only way we stopped it 
100% was to buy different parts.  It all depends on your 
application and circumstances though, but you may want to 
pursue that option as opposed to investing in hand cleaning, 
or other expensive options.

We also use RMA flux exclusively, and with some changes in 
our cleaning parameters (reduced pressure and temperature on 
our in-line aqueous) we reduced it a lot, still cleaned our 
boards adequately (ionic clean test) but never really 
stopped the problem.  Even hand cleaning will remove 
markings and is much harder to control.

Hope this helps!
Steve McBride
[log in to unmask]


______________________________ Reply Separator _________________________________
Subject:      [TN] How to Clean RMA Flux?
Author:  PC:[log in to unmask] at INTERNET
Date:    6/1/98 1:26 PM


  I'm looking for pointers to information on how to clean RMA flux from 
  circuit boards.  We're doing contract assembly and the design currently 
  specifies RMA flux.  (Build specs are basically WS-6536 and Mil-Std-2000, 
  NOT 2000A or J-Std) We've got an in-line aqueous system (using Armakleen 
  detergents) in place, but it's removing markings from diodes (and the 
  markings are required to be readable).  We've also been using a solvent 
  vapor system (AK-225), but it's attacking the adhesive bonding heatsinks 
  to the boards.

  Anybody care to make suggestions for RMA flux cleaning approaches or 
  pointers to likely candidates for a)information or b)product 
  representatives?

  Thanks
  Steven Axdal
  General Dynamics Information Systems 
  [log in to unmask]             612-853-3830

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