Thanks Amol. I'll look at this more closely. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Kane, Amol (349) Sent: Wednesday, March 22, 2006 7:17 AM To: [log in to unmask] Subject: Re: [TN] mixing lead-free solders Hi Phil, Based on the info in the e-mail, you say you are using SAC305 in the wave.......did you do any testing that proved that SAC305 was superior than SN alloy in wave? Or is this an absolute requirement for the product/process? We used SAC 305 in wave and ended up with Hot Tears on greater than 90% of all TH joints........you may have the following issues 1. if you get hot tears, current IPC spec is not sufficient to pass/fail them (because it is impossible to see the bottom of any of the tears @ magnifications mentioned in IPC 610) 2. I did some X-sectioning and X-ray analysis of our samples, and even though they turned out OK as per IPC, testing them was a hassle to say the least. So be careful before using SAC305 in wave. Good Luck Amol Kane M.S (Industrial Eng.) Process Engineer Harvard Custom Manufacturing 941 Route 38 Owego, NY 13827 Phone: (607) 687-7669 x349 [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (AZ75) Sent: Tuesday, March 21, 2006 4:36 PM To: [log in to unmask] Subject: Re: [TN] mixing lead-free solders I've seen several presentations that shows that to be an effective combination. All other things being equal, you should be fine. Dewey -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting Sent: Tuesday, March 21, 2006 2:07 PM To: [log in to unmask] Subject: [TN] mixing lead-free solders Good afternoon, As we move further into LF conversion I was curious what you, the gurus of TechNet, thought about the possibility of mixing LF solder alloys. We are converting our manufacturing operation to SAC 305 for wave and hand solder. We have a CM that is using Sn100C in their wave. There is the potential to have to manually repair a board built with Sn100C by hand soldering with SAC 305. Are there any reliability issues with this? Assume the board will be properly cleaned after soldering. I haven't looked into our SMT CM and their process, but it could be similar. I'd hate to have to run three or four lines to keep each alloy separate. As it is I must manage Sn/Pb and SAC 305. Thanks in advance. Phil --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------