610F is for assembly. What you are looking for should be in one of the PWB fabrication standards, such as 6012, 2222, or 2221. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez Sent: Thursday, February 11, 2016 2:06 PM To: [log in to unmask] Subject: [TN] IPC-A-610-F Fellow TechNetters: In the above stated standard DON"T see anything that refer to a defect from the desmear process which created a bow/flex, hour glass shape, on the copper hole wall from uncleansed debris. No lead will be inserted in this PTH. Is this type of anomaly acceptable. I don't suspect that the laminate is FR4 at this time. Perhaps later will identify. Victor, ______________________________________________________________________ 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] ______________________________________________________________________ ______________________________________________________________________ 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] ______________________________________________________________________