Gary Tell engineering that a conformal coating does not SEAL against moisture. All coatings breathe allowing air, that may contain moisture, to move in and out of the coating film; and water, given enough time, will go through everything... Also inform them that thicker is not always better. Acrylic coatings (Type AR) that are qualified to MIL-I-46058C and meet IPC-CC-830 will perform optimally at a coating thickness of 0.002 ± 0.001 mils. (50 Micron ± 25 Micron). The application you describe is not dissimilar to aircraft seat entertainment systems - many using AR coatings - and you really don;t want to know what people do in their aircraft seat! How about superloos? These are street toilets that are fully automatic....use your own imagination....and they use AR coatings. I should be interested to understand your engineers proposed test protocol... Kindest regards Graham Naisbitt [log in to unmask] Phone: +44 (0)12 5252 1500 Mobile: +44 (0) 79 6858 2121 --------------------------------------------------- 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 -----------------------------------------------------