Heat is transferred via convection, radiation, and conduction. A sealed metal box takes care of radiation and convection, so as you correctly point out, conduction is the next frontier.
I'd say foam board , but I don't know specifically what kind of foam. ------Original Message------ From: John Ackermann N8UR Sender: time-nuts-boun...@febo.com To: Discussion of precise time and frequency measurement ReplyTo: Discussion of precise time and frequency measurement Subject: [time-nuts] Thermal insulation choice? Sent: Jan 6, 2012 11:39 AM I am looking for a readily available (from Home Depot or other local source) insulating material to use in a chassis that's housing a sensitive OCXO. My goal is just to slow down any external thermal transients so the oven loop has time to react gracefully. I'm thinking of something in sheet form that I could glue to the inside bottom and side of the metal chassis. The trimmed sheet sizes will each probably end up being around 4 x 8 inches. I have enough clearance for a thickness of a half inch or so. I'd like to avoid a bat material as that would be hard to mount neatly. Long lifetime (ie, not getting all crumbly after a few years) is important as I don't expect this oscillator to get cold until I do. Any suggestions of a material to look for? Thanks, John _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.