[time-nuts] OXCO insulation

[Howard Davidson]

Try polyimide foam. Rated to 300 c.
http://www.professionalplastics.com/POLYIMIDEFOAM

 
hld 

Howard L. Davidson 
hld42 at att.net 





>________________________________
> From: Dave M <dgminala at mediacombb.net>
>To: Brian.Inglis at SystematicSw.ab.ca; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Tuesday, February 24, 2015 4:32 PM
>Subject: Re: [time-nuts] OXCO insulation
> 
>
>Ok, there has been a couple replies suggesting aerogel.  I've read a bit 
>about it, and understand that it's extremely light and effective, but quite 
>difficult for a hobbyist to make.  Also, probably very expensive.  Is there 
>a source for very small quantities of it?  Is is flexible enough to wrap 
>around a cubical or cylindrical object without destroying it?
>I've considered fiberglass as a cheap, available insulation, and will 
>probably be what I use to repair my oscillators.
>
>I'm very leery of trying to use Great Stuff household foam insulation.  I 
>just don't want to risk having another failure because of it.
>
>Cheers,
>Dave M
>
>
>Brian Inglis wrote:
>> On 2015-02-22 17:42, Charles Steinmetz wrote:
>>> Brian wrote:
>>>
>>>> Thought of trying aerogel insulation?
>>>> Dust free varieties avoid handling issues.
>>>
>>> Be careful not to over-insulate the oven -- it depends on a certain
>>> amount of heat flow to ambient to balance the heater.  The stability
>>> of the heater control loop depends on having the correct amount of
>>> thermal resistance from oven to ambient (also, on the thermal
>>> resistance being distributed similarly to the original scheme).
>>
>> R-value for commercial aerogel insulation is about double rigid
>> polyurethane insulation, so half the thickness would be about right.
>
>
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