Lupita,
Listen to your suppliers! My previous company had immersion tin
as a final surface finish, which I was directly involved and after
several months of trying to determine your same question I would
say that 6 months is tops especially if you take into consideration
if the board you are assembling is multiple pass through wave
solder. All of this testing/evaluation was performed using SERA
(sequential electromigration reduction analysis) and at the time
evaluating the three biggest players Dexter, Omikron, and
McGean Rohco.

Tony Steinke
----- Original Message -----
From: Lupita Roberts <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, March 20, 2002 8:34 AM
Subject: [TN] FW: shelve life of pwb's


> I am wondering if anyone can help me with the shelve life of raw
> PWB's. I was experiencing solderability issues and oxidation issues
> with some boards. I was told by several suppliers that White Tin only
> has a shelve life of 6 months and they were not warrantied beyond that
> point. I have been unsuccessful in trying to find data in regards to
> this issue.
>
> Suzanne Foulkes
> QC Supervisor
> Inservco Inc.
> LaGrange, Ohio 44050
>
> [log in to unmask]
> [log in to unmask]
>
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