I am experiencing open circuits in blind vias on FR4 boards and I am interested if other PCB users have experienced similar problems. It seems that the plating thickness varies along the length of the blind via and the open circuit occurs at the point of minimum plating thickness. I am wondering if this is an industry-wide problem or whether one supplier has process problems. Regards Terry Exell ############################################################## TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################