A question from a colleague of mine. Subject: Water soluble flux rinse
water.

What is the minimum water cleanliness level of the final rinse for
assembled/soldered PCB?

*That depends a great deal on what you are cleaning and how clean do you
want to get the substrate?  I have found that the best cleaning comes from
deionized water.  I generally consider RO water to be 100 kilohm-cm up to
about 1 megohm-cm and DI water to be above 1 megohm-cm.

Doug Pauls
Rockwell Collins

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