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]