Rats! I was going to make the space mushroom quote!

Yeah, you could use perlite as a filler, but I'm not sure it will  
provide the strength in compression you'd need to avoid having the  
glass crack. Best to get a proper dewar and stick the project in there  
if you want to go that route.

I think you'd do almost as well with some kind of box with thick  
styrofoam sheets attached with expanding insulating foam. Of course if  
you do that, your fire resistance rating goes out the window...

The real limiter here, of course, is what kind of precision is  
required for the temp control. If they need +/- 5C, then it should be  
pretty easy. If they need +/- 0.05C, then things get a little more  
involved.  :-)

-Pete

On Sep 3, 2008, at 8:57 PM, Jinx wrote:

>>> With the added bonus that, if you're not careful, you can  grow
>>> mushrooms
>>> :)
>>
>> Not once you pull vaccuum on the Perlite.
>
> What about space mushrooms ?
>
> Another option for the enclosure might be a small fridge
>
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