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

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