Mail*Link(r) SMTP               FWD>RE>Defluxing complex electr
WRT Bruce Wooldridge's response, the flux type is RMA.  As a potential
solution, we are seeking customer approval to use a low residue flux.  

As a correction to a translation error in the  original message, the assembly
cannot be heated above 150 degrees F. 

Mary Davis
[log in to unmask]

--------------------------------------
Date: 4/27/95 9:23 AM
From: bwooldri
Mary,

Your message does not include the type of flux you are using in 
your assembly.  I don't know if you have any flexibility in 
changing flux types but that may be your answer.  Even if you 
can't change flux type it is still critical to understand what 
you are using to provide a good answer on cleaning techniques 
and/or chemistries.

Bruce Wooldridge
DSC Communications

[log in to unmask]


______________________________ Reply Separator
_________________________________
Subject: Defluxing complex electroni
Author:  [log in to unmask] at SMTPLINK
Date:    04/26/95 04:05 PM


                       Subject:                               Time:12:45 PM
  OFFICE MEMO          Defluxing complex electronic assys.    Date:4/26/95
Subject: Defluxing complex electronic assemblies

Are users successfully replacing Freon TMS vapor degreasers used for 
defluxing complex electronic assemblies, i.e. those with hard-to-rinse 
capillary spaces?  

Specifically, I am dealing with a 20 year old military design, a hinged stack

of through-hole PWB's hard wired together via a cable assembly which 
incorporates shrink sleeving, solder sleeves and insulated stranded wire. 
The construction contains many thermoplastics, labels, wire tags, 
polyurethane elastomer connector potting and neoprene grommets.  The assembly

cannot be heated above 150#161#F.

I am reluctant to use the low vapor pressure semi-aqueous cleaners  or 
saponifiers because of rinsing problems.  Do users have experience with 
either of these approaches in a similar application?  

I am looking at a batch process using either IPA or AK225.  Any other 
suggestions?  The flammability of IPA is a drawback.  The cost, lack of 
industry history, and eventual phase out of AK225 are drawbacks. What 
experience has anyone had using these chemicals in bulk?  What equipment (in 
addition to S&K, Jetclean & ReEntry/Eccolink) is on the market that will 
handle IPA?

Any information from users would be sincerely appreciated.

[log in to unmask]