Copper is not a final finish. Solder, gold, soldermask.. Are final finishes. Mahendra -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Franklin Asbell Sent: Monday, February 04, 2008 1:52 PM To: [log in to unmask] Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish I've always interpreted that to mean bare copper prior to final finish, are we sure that was not the intention, as these criteria are covered elsewhere, perhaps we should remove this or state these are requirements prior to final finish??? As for delivering product with bare unprotected copper finish, I would think these would only occur in rare instances under quite unique conditions, in those instances the persons processing the boards with bare unprotected copper most likely have a process that may not need to be addressed any further within 6012. Just my thoughts. Franklin -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of John Perry Sent: Monday, February 04, 2008 2:53 PM To: [log in to unmask] Subject: [IPC-600-6012] Bare Copper as a Surface Finish 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)