We did a study looking at improving our SIR results for bare PWBs
(sounds like your dealing with PWBs).  We DID find that for our cleaning
process (a simple PWB washer (like a diskwasher) and we found the best
results with a saponifier at about 4% by volume. Cost to us was trivial
as we already had the cleaner.

Jim

> ----------
> From:         Andy RJ McKean[SMTP:[log in to unmask]]
> Reply To:     TechNet Mail Forum.;[log in to unmask]
> Sent:         Monday, January 19, 1998 1:35 PM
> To:   [log in to unmask]
> Subject:      [TN] passing grade SIR testing
>
> There is many archived "tech-letters" that address the issues of "how
> to", "what to do", and "the theory of" SIR testing.  But what can be
> done in practical terms in a production process situation, to address
> "borderline" SIR results.   This with city water rinses, at both
> pumice preclean (prior to coat) and post HASL cleaner. HASL with the
> use of no-clean flux.
>
> Is there a cleaner, chemical change, etc... that has made the
> difference to others that may enhance our SIR results in the future?
>
> Andy McKean, PEng
> PCI, Toronto
>
> ##############################################################
> TechNet Mail List provided as a free service by IPC using LISTSERV
> 1.8c
> ##############################################################
> To subscribe/unsubscribe, send a message to [log in to unmask] with
> following text in the body:
> To subscribe:   SUBSCRIBE TECHNET <your full name>
> To unsubscribe:   SIGNOFF TECHNET
> ##############################################################
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for
> additional information.
> For the technical support contact Dmitriy Sklyar at [log in to unmask] or
> 847-509-9700 ext.311
> ##############################################################
>

##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TECHNET <your full name>
To unsubscribe:   SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
##############################################################