Graham, Doug Et al,
First let me say, thank you for your candid responses, secondly, on
reflection perhaps I should have been a little more specific with the
information I provided so I'll put the record straight.
The issue is a little delicate but in a nutshell a foreign OEM is
carrying out some work for us who use only WS flux; historically they
used RMA but in 1997 they had CSL carry out a SIR exercise with a view
to converting to WS.
The work they are carrying out for us is quite low-tech but nevertheless
requires qualification therefore they carried out a similar exercise
(with CSL) using the two types of WS fluxes they now process. The test
vehicles used were the IPC B36 boards with PLCC's soldered to them using
all their relevant processes, indicative of the component technology to
be assembled.
Sample SEC/ROSE testing will be carried out by them as part of their
process controls, the consideration of the Ion Chromatography was to
analyse the first of the production standard boards having watched them
being built as unfortunately I wasn't there to witness the SIR exercise.
Iain.
-----Original Message-----
From: [log in to unmask]
[mailto:[log in to unmask]]
Sent: Wednesday, August 15, 2001 10:44 AM
To: [log in to unmask]; Braddock, Iain
Subject: RE: [TN] Cleanliness evaluation!
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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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