It is my experience that the analysis of Tin in solders is not the most
accurate and reliable test, normally done by wet chemistry. OK the test house
may claim + or - 0.01% however I have had samples re-tested before and had
differing results obtained. I would advise having samples re-tested and be
absolutely sure of your tin level before considering messing around with the
tin content by adding more tin. A good guideline is to calculate the
theoretical weight of tin lost since the last analysis. If it's several kilo's,
you'll know that there's something amiss with the test result !

Bryan Kerr
Alenia Marconi

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