Kathy Dielectric performance of metal?... I think you mean electrical performance but maybe the question does, in fact, relate to skin effect. It will be frequency dependent as has been noted. The assumption is that this is RF based on the use of Teflon and the magnetic properties of nickel are not going to help the cause, that aside gold over copper has been used in the past for RF/Teflon boards. Silver is another choice and tin has also been used over the years. Good luck with your project, Joe --------------------------------------------------- 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 -----------------------------------------------------