[time-nuts] Thermal insulation choice?

lists at lazygranch.com lists at lazygranch.com
Fri Jan 6 16:41:26 EST 2012


I don't see how the foil is useful here. The metal box takes care of radiation. 

-----Original Message-----
From: Graham / KE9H <timenut at austin.rr.com>
Sender: time-nuts-bounces at febo.com
Date: Fri, 06 Jan 2012 14:26:46 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Thermal insulation choice?

John:

The solution that will last longer than you will, is alternating
layers of aluminum foil (kitchen variety) and (dry) fiberglass cloth
(sold as "roven woven" anywhere they sell fiberglass supplies,
looks like white cloth, you can cut with scissors.)
Good to cryogenic temperatures, no crumbling mechanisms like
foams. Just seal the edges of the stackup with tape, so air can not
move in and out of the stack by convection.

--- Graham / KE9H

==
On 1/6/2012 1:39 PM, John Ackermann N8UR wrote:
> 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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