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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cc:    (bcc: Ulrich Zimmer/Multek/DIIG)
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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