Regarding the LF dross. I suspect that you are referring to intermetallics rather than dross. The source that told you otherwise is correct. Copper-tin intermetallics will now sink rather than rise to the top. This is due to the lower density of Pb-free alloys. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Bang Sent: Tuesday, July 05, 2005 9:50 PM To: [log in to unmask] Subject: [TN] LF Selective and Wave Soldering Hi all, Just like to know whether anyone has done Lead Free Selective Soldering. Did you have any issues or difficulties? Secondly on LF dross. I read somewhere that the density of LF dross is greater than SnPb and the LF alloy, it will sink instead of float. However a source who are using LF solders have told me otherwise. Is this a big issue, if an issue? How would you handle this? Regards Dennis Bang ################################################# ***** CONFIDENTIAL ***** We apologise if this message has been sent to you in error. We are committed to protecting the confidential information of our customers, our vendors and GPC Electronics. If you have received this message in error, we would appreciate you removing it from your system and informing us of the error, so that we may continue to improve our processes. Please note that whilst we check our outgoing mail, you should also check any attachments for viruses and defects before opening them or sending them on. Thank you. ################################################# --------------------------------------------------- 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 847-615-7100 ext.2815 ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------