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

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