Bev, How thick do you consider "thick undercoat"? The NCMS PWB Surface Finishes work from several years ago looked at Pd surface finishes. One issue with Pd is that it dissolves much slower than other finishes. The best data I've seen on dissolution rates is the 1969 Wally Bader work published in the December Welding Journal. For near eutectic SnPb solder at 450F Material Radial Dissolution Rate (10-6in/sec) Gold 117.9 Silver 43.6 Copper 4.1 Palladium 1.4 Regards, George George M. Wenger (908)-546-4531 Reliability Engineer RF Power Amplifier Group Andrew Corporation, 40 Technology Drive, Warren, NJ 07059 [log in to unmask] -----Original Message----- From: Bev Christian [mailto:[log in to unmask]] Sent: Thursday, July 31, 2003 1:28 PM To: [log in to unmask] Subject: [TN] Thick Palladium on Leads Technetters, I have searched the archives and all I have been able to find is one informative e-mail from Phil Hinton from August 22, 1998. Has anyone every run across palladium as a thick undercoat? if so, what, if any, grief did it cost you? regards, Bev Christian Research in Motion --------------------------------------------------- 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 ----------------------------------------------------- ------------------------------------------------------------------------------------------------ This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any unauthorized use of this email is prohibited. ------------------------------------------------------------------------------------------------ [mf2] --------------------------------------------------- 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 -----------------------------------------------------