Hello, Pardon, but I thought that it was liquidus plus 20 degrees for 5 seconds to ensure a good metallurgical bond. So do you mean 217 (solidus for SAC305)+ 20 + 15 = 252 for 5 seconds or 221 (liquidus for SAC305) + 20 + 15 = 256 for 5 seconds? Just want to make sure that I am not missing something! Thank you, David Tremmel VALUE RECOVERY Quality is the nature of the service -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /* Sent: Viernes, 15 de Febrero de 2008 09:28 p.m. To: [log in to unmask] Subject: Re: [TN] Samsung Memory BGA Failure Hi Phil, Your T-measurement method is perfect—you IN FACT know what the T's are. My recommendation for reflow soldering is: Liquidus + 20C + (15 to 20C when soldering to NI) for 5 seconds minimum; thus in your case we have 217 + 20 + 15 = 252C for 5 seconds So, it is still likely you have not formed a decent metallurgical bond. Werner ************** The year's hottest artists on the red carpet at the Grammy Awards. Go to AOL Music. (http://music.aol.com/grammys?NCID=aolcmp00300000002565) --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 -----------------------------------------------------