Hi Ian
it depends when you do that testing.
Tests right after soldermask shoud have values around 0.5-0.8 up to values
< 2 (dry film soldermask).
It also depends whether you heat up the solution or not; the american folks
mostly have the heater applied while we are measuring @ room temperature
because of security reasons.
hope that helps
ulrich
Ian Boyton <[log in to unmask]> on 08.07.99 17:53:16
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Subject: [TN] Ionic testing for contamination
Hi all
Can anyone tell me what the industry std/limit is for micro grammes of NaCl
per sq cm found after ionic testing? I have a value under 5 and have a set
fail limit of 20ug. This is after a 20 min test.
Best Regards
Ian Boyton
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