For those that use bare copper for RF application, I have a few questions - Does the RF board have a digital section and is the area a bare copper final finish? Do you have any concerns about corrosion or galvanic attack of the bare copper finish in the PTHs for your applications? I am trying to understand what cautions IPC-6012 would need for the bare copper final finish without impacting those that use this finish. Regards, Randy Reed Co-Chair IPC-6012 -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Mike Hill Sent: Tuesday, February 05, 2008 4:01 PM To: [log in to unmask] Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish Yes,I have one customer that does use true bare copper. mike -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]]On Behalf Of Gordon, Robert (J.) Sent: Tuesday, February 05, 2008 6:06 PM To: [log in to unmask] Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish You mean someone was using true bare copper? At Visteon we refer to an OSP finish as bare copper. -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Gandhi, Mahendra (Space Technology) Sent: Tuesday, February 05, 2008 9:51 AM To: [log in to unmask] Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish Gordon, OSP is a surface finish. Mahendra -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Gordon, Robert (J.) Sent: Monday, February 04, 2008 7:40 PM To: [log in to unmask] Subject: Re: [IPC-600-6012] Bare Copper as a Surface Finish John, We use OSP surface finishes for applications requiring a single soldering process. Generally, these boards are either single sided, non-plated through hole boards, single sided silver jumper boards and double sided, plated through hole boards. I would estimate that approximately 5% of our boards are OSP coated. Please do not remove it from tabel 3-2. -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of John Perry Sent: Monday, February 04, 2008 3:53 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)