Technetters, I have received some microBGAs which I have to reball and they have a no-clean flux residue which is difficult to remove. Also, when it comes in contact with our water-soluble flux it creates an acid which is not very 'friendly' to the part. Would any of the chemical gurus care to edify one of the uneducated ones why no-clean flux, when dried and allowed to set for a couple of months is so difficult to completely remove and what possible acids or chemicals are created when it is combined with water-soluble flux (type ORM1)? As always, I appreciate the responses I receive. David Tremmel Technical Manager BT Mexico _________________________________________________________________ ¿Cuánto vale tu auto? Tips para mantener tu carro. ¡De todo en MSN Latino Autos! http://latino.msn.com/autos/ --------------------------------------------------- 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 -----------------------------------------------------