Joey - this can be a point of contention especially if the customer doesn't want the boards for some reason. We try to find this at Pre-Prod Eng before we start the build. Most time we miss it and argue that this is not applicable in this area since the metal is designed to the edge of the board. We discussed this during the rev C meetings - I think this should be clarified better in the spec and my opinion is that if conductor to edge spacing does not meeting the guidelines of 2221 then the haloing criteria should be AABUS. As the distance to the edge of the board gets less, 3.3.1 becomes meaningless. Jim -----Original Message----- From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Jose A Rios Sent: Thursday, December 15, 2011 12:09 AM To: [log in to unmask] Subject: [IPC-600-6012] haloing wondering how others interpret the applicability of 6012c 3.3.1 (and its 6018 equivalent) with respect to haloing, for designs that have metal to the edge of a pwb, as shown below?? conductor to conductor spacing is highly compliant, distance from the solder feature to the first halo along the edge is less than 4 mils. to me 3.3.1 has a context where metal is away from the board edge by design, unlike the attached image..... Joey Rios PWB & Process Quality Eng'r Endicott Interconnect Technologies 1093 Clark St. Endicott, NY 13760 Office: 607-755-5896 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ NOTICE: This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________