The board shop would only be at fault (partially) in this case if they failed to express the fact that immersion tin is a poor coating for press-fit connectors...the remaining fault would be the process or design personnel... HASL is by far a better coating for use in press fit connectors...as you've noticed from the exposed copper...and yes, the hole wall will look pretty cra**y... This is one of those (DOH!!! we did not think this assembly process through well enough) situations Franklin ----- Original Message ----- From: "Ofer Cohen" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, April 30, 2003 9:47 AM Subject: [TN] External finish selection > Techneters, > The back planes of our products include many press fit connectors (1200 to > 6000 pins) and 100 to 500 passive components - resistors and capacitors, > mostly 0603 and 0402. In the past we used HASL finish. However, during the > last year we switched into immersion tin. Following some failures in the > coating processes, yielding exposed copper on external pads (and you can > just imagine what happens in the via and connectors pins holes), I consider > two options: > 1. Replace my old and known vendor, and look for one who will do a > great job in the coating, or > 2. Return to the good, old, well known and reliable HASL. > > I think that my tendency can be read between (or inside) my lines; yet, as I > have not made my final decision, I am open for other opinions. > > Regards > Ofer Cohen > Quality Assurance Manager > Seabridge Ltd. > > --------------------------------------------------- > 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 > ----------------------------------------------------- > --------------------------------------------------- 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 -----------------------------------------------------