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Date: | 27 Apr 1995 12:13:18 -0600 |
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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
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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
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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.
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