Can anyone help me on this issue .... We are using standard 2oz copper onto FR4 double sided board. We expect tracks in some areas to be subjected to temperatures between 135 and 140 degrees C due to high currents passing through the track. This temperature (or the current causing this elevated temperature) would be present occasionally (say once or twice daily for the life of the product) for about 10 seconds. I have some reliability questions for which I need some guidance; What is the long term effects should the copper laminate be subjected to this temperature. What is the maximum temperature that the tracks could be reliably subjected to for longer periods of time than that mentioned above. If anyone has any experience in this field or could point me in the right direction I would appreciate it. Regards Mike Meade ################################################################ 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################