Hello, I have a situation in which an assembled board has gone through a sort of "three point bend" - it was fastened to a metal carrier, while having a small protrusion in between, thus having to create a sort of an "arch" over the protrusion. Now, my board is a 0.090", made of polyimide and since it has a lot of copper in it - it is very difficult to see anything in a regular visual test. The bend itself was over a span of about 30mm, over a protrusion of about 0.5mm. It was very well fastened to place (a strong guy with the screwdriver), thus creating a plastic deformation in the board. My question is - are you aware of any studies or specs dealing with the allowable bend/flex/permanent deformation of assembled boards (especially those that apply to my situation)? Thank you in advance, Yehuda Yehuda Weisz Tel: (972)-3-6342045 Cel: (972)-53-556897 --------------------------------------------------- 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 847-509-9700 ext.5315 -----------------------------------------------------