Other than tin pest and batteries used in backup systems, I know of no issues with electronics operating at -40. Automobile electronics operate at temperatures well below -40 on a regular basis right here in beautiful Minnesota. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson Sent: Wednesday, June 01, 2016 12:36 PM To: [log in to unmask] Subject: [TN] FR4 in COLD environments Has anyone ever heard anything about the reliability of circuit boards in cold environments? (continuous -40C) I couldn't find anything on TechNet or in the Printed Circuits Handbook... thanks, Jack ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________