Are you sure that "tin whiskers can grow on ALL tin alloys"?  I thought only
pure under pressure (internal or external) are the ones got into trouble
(may be it is new century, it becomes more sensitive).  97% usually OK in
the past (if no pressure, no residue ionics).
As long as you use them fast, both solder and glue should be fine (solder =
real one with Pb in it; glue = well formulated and no flake separation from
its organic matrix).  no body like stress, including parts finishing...

jk

>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]]On Behalf Of Ingemar Hernefjord
>(EMW)
>Sent: Wednesday, June 19, 2002 5:11 AM
>To: [log in to unmask]
>Subject: [TN] tin whiskers - matte tin
>
>
>Hi,
>had a chat with NASA about a little tin whisker problem we had.
>Pure tin end caps on ceramic capacitors. Now, Sandra Winkler wrote
>that tin whiskers can grow on ALL tin alloys, not only pure tin,
>as some thought. Remedy is matte tin and tough disciplin in the
>plating organisation. I'll check with AVX and the others what
>solder they will use from  now on. Happened to read this last year:
>
>"At the one-day joint MEPTEC (MicroElectronics Packaging & Test
>Engineering Council)/San Jose University Lead Free Summit on
>January 10, 2001, matte tin was universally supported by the
>attendees by the end of the session. Over 50 companies and nearly
>100 individuals were represented. Remarkably, matte tin has made a
>comeback and will hopefully be here to stay." Sandra Winkler
>
>Q: do you ask for matte tin on cercaps for both solder- and epoxy mounting?
>
>/Regards/
>Ingemar Hernefjord
>Ericsson Microwave Systems
>
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