TechNetters, Due to copper trace cracking on a flex assembly, we would like to characterize the copper ductility. The crack occurs at a trace to pad junction on a specific batch, and a variation of the copper ductility is suspected. Any idea on how to assess it? I am suggested a Vickers hardness measurement, but I am unsure it can really be correlated to the exposed problem. Note also that the measurement would have to be done on manufactured flex, not specific coupons. --------------------------------------------------- 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 -----------------------------------------------------