Colleagues, Our IPC-6012B specification provides for bare copper as a final finish in Table 3-2, Final Finish, Surface Plating and Coating Thickness Requirements. The task group is evaluating whether or not this should be removed from Table 3-2 in the future IPC-6012 Revision C. Among the concerns with bare copper are instances of single-sided via protection that provides for entrapment of chemistries that attack the bare copper in the hole wall. If there are those of you out there who use bare copper as a surface finish, could you provide feedback to IPC as to how it is used in your applications? Thanks in advance, John Perry Technical Project Manager IPC 3000 Lakeside Drive # 309S Bannockburn, IL 60015 [log in to unmask] 1-847-597-2818 (P) 1-847-615-7105 (F) 1-847-615-7100 (Main)