David,

Yes, we have seen the yellow tarnishing on some product. It has been our
experience that the yellow tarnished product does not present assembly
issues using noclean paste in nitrogen and VOC free wave solder fluxes. We
do pursue the issue with our suppliers and assembly locations in order to
resolve.  We found in some cases that if boards are placed down on a surface
that has sulfur on it, the yellowing becomes particularly noticeable.

Thanks,
Robert Furrow
Printed Wiring Board Engineer
Strategic Supply Global Account Manager
Supply Chain Networks
Lucent Technologies
978-960-3224    [log in to unmask]

> -----Original Message-----
> From: David [SMTP:[log in to unmask]]
> Sent: Sunday, April 08, 2001 10:53 PM
> To:   [log in to unmask]
> Subject:      [TN] Immersion silver boards tarnish
>
> Has anyone ever exeprienced immersion silver MSP boards tarnishing, turned
> yellow after stored in ambient condition?
>
>

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