I'm pretty sure that won't work. You could use crushed firebrick instead of the perlite, but you stiil need the clay, (I think)?
The cheepest unsented kitty litter you can find will be bentonite clay. you can either crush it w/a mortar and pestal, or contrive some kind of grist mill setup. Or you can be lazy like me , and just dump it in a bucket of water and let it set for about a week, stirring well a couple of times a day to turn it into slip.
But the question on my mind is If you have firebricks already, why not just use them for the insulation?
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"and the pikes were all broken or bent, and the powder was all of it spent. Then Sir Grenville cried, in his English pride.Sink me the ship Master gunner! Split her in twain, fall into the hands of God, not into the hands of spain!
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