Help needed in interpretation of IPC-6012. Appendix A (page 37) calls out Table 3-8 and Paragraph 3.6.2.13 for External Conductor Minimum Thickness after plating. Table 3-8 shows that Minimum Surface Thickness after processing is 3.295 mils when the starting foil weight is 2 Oz. Our company specifies the finished copper weight as 2 Oz on the drawing. We do not specify the starting foil weight. PCB manufacturer is allowed to choose a material that he has in stock and plate it up to be 2 Oz. My question is - What minimum surface conductor thickness after processing shall be targeted if the starting foil weight is not 2 Oz? (The PWB house insists on having the conductor thickness 2.8 mils after processing. However, I cannot find such a number in IPC-6012.) Thank you, Veronika Anderson, C.I.D. Senior Electrical / Mechanical Designer PerkinElmer Optoelectronics 1330 East Cypress St., Covina, CA 91724 Phone: (626) 967-9521 X 236 E-mail: [log in to unmask] --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 ---------------------------------------------------------------------------------