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 ##############################################################