Iain and Doug

Whilst I wholeheartedly concur with what Doug stated, I do not agree for the
need for Ion Chromatography (IC) testing.

Iain, if you run a correct SIR test regime on your proper proposed
production process, and you have acceptable results, then you can feel
comfortable that you will have a reliable end product. If you have failures
in this test, then you need IC to find out precisely what is present on the
surface that may be causing your problem. Yes you should then use ionic
extract testing (SEC/ROSE) to keep an eye on your process conditions - but
make no attempt to correlate SIR with SEC/ROSE results.

I would suggest that you retain the use of SIR equipment as a
process/quality monitor. Taking sample coupons at each stage of the
production process and running short tests will (probably) give you the
necessary indicators if the process or process materials are changing.

To ensure that you have used the correct test protocol, I assume that you
took on board the recommendations as published by the EU project partners
NPL, Siemens, NMRC and Lares Cozzi. If anyone wants a copy of this work, let
me know.

By the way, running IPC-TM-650 did they test to Appendix D of J-STD001 (or
is it now B? Doug??) or did they run to 6.2.3. or 6.2.3.3? What was the
coupon they used? What was the pitch/width they used? What was the test
voltage used?

Regards, Graham Naisbitt

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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Iain Braddock
Sent: Tuesday, August 14, 2001 02:54
To: [log in to unmask]
Subject: [TN] Cleanliness evaluation!


I sent this out last week but I believe it didn't get through so I'm
trying again.


I would appreciate some help here from you guy's & gal's!

On considering the switch from using RMA flux for Class 3 to OA-(WS) for
board assembly a full SIR testing exercise has been carried out
externally IAW IPC-TM-650 using appropriate test coupons; this proved
satisfactory.

ROSE testing will be used locally as a form of process control but I was
wondering whether their would be benefit in using ion chromatography to
assess the first off's pucker hardware...........maybe one for you Doug!

Iain




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