Victor Lead free solder in a wave solder machine does solve a lot of copper from a PCB. Trials that where done at ERSA with a solder pot temperature of 275°C and a conveyor speed of 1m/min showed that approx. 12um of copper have been eaten away from a SMD pad. The only way to avoid this is to lower the temperature as far as possible. The lowest wave temperature we where able to solder through hole on a 4 layer FR4 with 2 fully metallised inner layers was 245°C; 1m/min with SnAgCu. However, this is was the lowest limit. We settled now on 250- 255°C for a pilot production. Best regards Guenter EMPA Swiss Federal Laboratories for Materials Testing and Research Centre for Reliability Guenter Grossmann, Senior Engineer 8600 Duebendorf Switzerland Phone: xx41 1 823 4279 Fax : xx41 1 823 4054 mail: [log in to unmask] --------------------------------------------------- Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------