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TO: I4235700 IBMMAIL new address for ipc technet 25.6.96
FROM: DSTEWART EX2 D.Stewart - Product Development Manager.
DATE: 1 November 1996
SUBJECT: re-immersion silver
REFERENCE: Stephen Ayotte IBM
Steve, I think that you are referring to a finish known as Alpha
Level, which is supplied by Alpha Metals, part of the Cookson
Group. The finish looks cosmetically very good - like a perfectly
flat HASL finish - and is an immersion silver topped with an
organic coating to prevent oxidation of the silver. We have
solderability (wetting balance) results, which I could share with
you if you like. I know of one OEM which does single sided only SMD
assembly which has approved the finish, but I do not have any
information on double sided + through hole soldering.
Dougal Stewart
Exacta Circuits
Scotland
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