I'm a flexible kinda guy... I have used flex in wicked cold temps (degrees K) and wicked hot (beyond component survival) and I can only think of one application for the ole /1 product (adhesive) and that is build to print heritage parts. Usually the discussion is based on ED verses RA copper. I like the ED the RA work hardens pretty rapidly. I like thin /11... .002 with 1/2 over 1/2; the most common being .003 with 1/1 Cu. I can go on and on... let me know... and best of luck. Two flex tips: keep vias AWAY from rigid and flex intersect and watch your impedance numbers. Boston Brad --------------------------------------------------- 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 -----------------------------------------------------