Ted:

If my understanding of the situation is correct, you should find no literature on intermetallic formation with fused, or reflowed tin/lead, because it virtually does not happen.  The intermetallic happens only with Tin and Copper, not with lead and Copper, and since the Tin/Lead is largely Lead, it may happen at the surface, but essentially stop.

This is why we loved Tin/Lead as a finish for so long...the only problem with it being that it is usually not flat enough....and not contains LEAD....which of course, will pollute the earth...from which we have so recently removed it...

I suspect that you might have some issues with surface oxidation, which should be able to be dealt with by an aggressive flux, but intermetallic should not be an issue.

Rudy Sedlak
RD Chemical Company --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/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 ---------------------------------------------------------------------------------