Has anybody defined recommended maximum copper thickness (weight) with specific size SMT components? For example; 2 oz. copper max with 0603 resistors and caps. My thoughts process here is I know that with thicker copper there is more undercut by the etchant. There must be a point of diminishing returns for pad size to maintain good manufacturing capabilities, not to mention the remote possibility of rework. Some of our "power electronics" boards may be specified as 4 oz. copper for the large power components, but this might be an issue for the small control circuit components like 0603 foot prints. Thanks in advance. Phil Nutting --------------------------------------------------- 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 -----------------------------------------------------