Hi there, We are a medial device manufacturer and we're getting our finished PCB assemblies via a local vendor. We are getting many rejects as we try to implement IPC-A-610. Our trouble is in 7.2.3 solder mask coating breakdown. MY QUESTION: We are getting a small areas of exposed copper. Stuff you can't see with the naked eye. This is due to either PCB fabrication or assembly process. IS THERE AN ACCEPTABLE EXPOSED AREA THAT CANNOT BE EXCEEDED OR SHOULD ANY EXPOSED COOPER NO MATTER HOW SMALL IT IS BE REJECTED. Thank you for your time and I look forward to getting an answer soon. Arif Quronfleh Sr. Project engineer NeuroCare Group ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################