Can anybody enlighten me on the minimum and maximum operating temperature of FR-4? I am more concerned with the minimum temp as there seems to be plenty of reference to the maximum. What I need to know is if it would be safe to specify a -40 deg.C to +80 deg. C operating range for an assembly using FR-4 as the PCB laminate material (given that all comonents are approved for this temperature range!) Any info would be greatly appreciated. Adam Hawes PCB Designer GenRad Ltd. ################################################################ DesignerCouncil 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ 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 ################################################################