July 26, 2007

I have a question to pose for Tech Net folks based on my limited experience 
in this area.  If I have a cleaning machine that includes a built in 
continuous test for rinse water or wash water resistivity, do I need to then 
still do an independent ionic contamination test using the standard DI 
Water/Alcohol Ionic Contamination test?  If so why?  What is the technical 
relationship between the two tests?  Can one equate the cleaning machine 
Resistivity Test results to the J-STD-001 cleanliness limits or the results 
of the Ionic Contamination test?  If so, how?  Have folks experience shown 
that one can pass the cleaning machine Resistivity Test and still fail Ionic 
Contamination Test?  Why?

Doug, Pauls, as the worlds (wow) expert in this area, what do you say (It 
depends)???.

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