There are some numbers being thrown around for immersion Tin Thickness that are a little unrealistic. Getting 40+ microinches (1+ micron) is pretty difficult, to impossible on a production basis. It can be done in a lab, with a freshly made up bath, but I have never seen even 50 microinches ever, and this is with any immersion Tin process. Is anyone even maintaining 40 microinches in production? I suspect that you have to run your process pretty carefully to maintain 30+ as the bath gets old. Will production people comment please? 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 ---------------------------------------------------------------------------------