Rick, Nothing specific about Koki, but here are some questions. Most times I have found the solution with these questions. 1. How is the profile measured? (TC in air or embedded in board?) 2. How is the paste controlled? (Is it sensitive to moisture?) Hope this helps. Paul -----Original Message----- From: Rick Thompson [mailto:[log in to unmask]] Sent: Thursday, January 02, 2003 3:21 PM To: [log in to unmask] Subject: [TN] Koki Lead-free Solderpaste? Hi, Does anyone have any experience using Koki Lead-free Solder Paste? In particular, their S3X58-M301-3 series? We're using this at our Thailand facility to solder some micro-BGAs and are seeing alot of voiding and subsequent failures related to the BGA. The balls on the BGA are eutectic, 63/37. Reflow profile is meeting the solder paste manufacturer's recommendations. Unfortunately, I'm trying to find an answer for this long distance as I'm not at the facility. If anyone has any experience / recommendations with this solder paste that they can share it would be greatly appreciated. Thanks, Rick Thompson Sr. SMT Process Engineer SMTEK International, Inc. +1 (805) 532-2800 [log in to unmask] --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------