howdy folks! can anyone explain the possible causes in a manufacturing process that would result in interplane separation when the boards are thermal stressed?? the glass transition rating of the laminate material is 170-180 (FR4-06) and the temperature cycle parameters are: -40 C to +50 C with a 6 degree /min rate of rise, on hour dwell at the extremes, and 12 hour total cycle time. ################################################################ 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 ################################################################