[Cob] Cob refractory cement and cubic feet per gallon.

[Amanda Peck]

>From the literature of a company that makes one kind of refractory cement.  
I chose this one not because I'd used it but because it was the first one 
that came up on a search, and besides the explanation makes perfect sense.

By the way, someone emailed me with the conversion from five-gallon buckets 
to cubic feet (or from there to cubic yards)  He thought about 2/3 of a 
cubic foot in a five-gallon bucket.  The math can be done (quite 
inaccurately--in your head--I think the figure is really something like .66 
gallons per square foot per inch) by using the slightly over .6 gallons per 
square foot per inch of rain that you can collect off your rainwater 
collection system--a cubic foot would be 12 of them--or over 7 gallons per 
cubic foot.  In any case I think we'd both thought that five would be closer 
to a cubic foot.
..............
http://budgetcastingsupply.com/Castable_Refractory_Kast-0-Lite-26-LI.html

Kast~O~LITE® is a castable refractory cement manufactured by A.P. Green / 
Harbison-Walker. It is used as the insulation material in foundry furnaces. 
Its maximum temperature is 2600 Degree Fahrenheit . You'll need 86 lbs of 
material per cubic foot, not counting mixing losses.

Refractory cement is unlike regular cement in that regular cement has water 
bound up in the compound. Heating regular cement will cause the water to 
flash to steam and destroy the structure. Refractory cement allows the water 
to be driven off during curing and in the initial heating. Refractory cement 
has elements that trap many microscopic air pockets in the mix that provide 
a high degree of insulation.


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Just in case PJ Benet-Davis isn't the only one who wants to know:

What is refractory cement?

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