I'm looking for processes to augment our conformal coating in protecting non-underfilled BGA's against harsh wet environments (salt fog, condensation, etc). Although it hasn't happened yet, I think it's a matter of time before moisture will penetrate my imperfect conformal coating and start a corrosion experiment under one of my fine pitch BGAs. Parylene is a natural, but comes with its problems and currently would require going to a sub-contractor. Other suggestions have included thicken our traditional urethane conformal coating and dispense a fillet around the part, sealing it from the external environment. We have done some testing that shows using urethane conformal coating as an underfill does not lower reliability. Any suggestions / comments. Scott Newland Harris GSCD E-Mail [log in to unmask] For a brain teaser try: http://pao.gsfc.nasa.gov/science.html This information is only intended for the use of the individual or entity named in this email. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the contents of this information is strictly prohibited. If you have received this email in error, please notify me and delete it immediately. --------------------------------------------------- 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 -----------------------------------------------------