Hi:

Although the data is not widely available, white tin does oxidize. It is
very dependent on temperature and humidity so storage is always an issue. If
the boards are stored at ambient conditions it is very likely that oxidation
has occurred and the tin has become resistant to soldering. SnO is pretty
resistant to reactivation although it should be possible. You might ask the
particular manufacturer of the white tin if they have any suggestion for
their particular product.
----- 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]
>
> --------------------------------------------------------------------------
-------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send e-mail to [log in to unmask]:
SET Technet NOMAIL
> To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail Archives
> Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
ext.5315
> --------------------------------------------------------------------------
-------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------