SEI part number: RSM-2-160-50 We're using standard NC solder 63/37... and 65C flux... The wetting's just not happening on the board side... we've done these for years without this problem... it's kind of looking like solder fractures. Soldering irons: Hakko 936 ESD with 1.2 tips... temps: 750F Our Cleaning capabilities? ... Ultrasonic/deionized H20... we also have some Bronson mix... We have not washed these, but I wanted to throw this out to you all to see if this may be pointing to some other problem... Any assistance is appreciated... John Grabski III Badger Technologies Inc. --------------------------------------------------- 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 -----------------------------------------------------