Hi paul I thought you ment flex bend test. There is a test we did for a 24 inch board I made that had led's ever 1/4 inch , used for emergency lighting on 737's. w ehad to do a bend test on each lot , we designed a coupon that went on the side and replaced one board, it consited of a series of vias representing the actual layout of the leds, we conneted the vias in series and put in 2 large pads . the test was to bend the sample around a plastic section ( sewer pipe about 18 inches in diamiter or may be even bigger. we used a stanford 4 wire resitance meter and a failure was a 5 % rise in resistance ( ie holes starting to pull apart ) I think they had to pass 5 or 7 bends. it turns out aircraft bend a lot so they were trying to determin flexibility in the plating. however the led's in the middle of the board were not as bright as the end ones, so we increased the plating to 3 oz and the boards always passed the bend test , doubled the number of bends, we then made 6 oz boards and they were vertialy industructible, so the amount of plating in the hole effects bend radius tests on figid fr4. hope this helps best regards robert tarzwell ----- Original Message ----- From: "Stolar, Paul W" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, August 18, 2003 2:04 PM Subject: [TN] FW: Bend test Is there an industry standard bend test? I have found many people doing them, but no standard. Paul Stolar Materials Engineer Houston Technology Center Baker Atlas 713-625-5376 713-625-4949 (fax) --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------