[Stoves] Diatomous earth insulative kiln bricks

[steven offord]

I'm teaching a few people how to make Rocket Stoves at a community CoOp near Totnes, Devon ,England early next month.
Pretty much just following Aprovech instructions.
The course is very short and I won't have time or kiln facilities to get into making our own insulative bricks. 
I do however have a supply of diatomous earth insulation bricks which seem to have worked well in a very small (olive oil can) Rocket Stove. 
These bricks are manufactured from the dredged  casings secreted by algae and are intended for use as secondary insulation in ceramics kilns; if used at the hot face they melt.  Those in my small stove haven't melted yet.  I've not heard of Aprovecho or anyone else using them in cook stoves.
 I'd appreciate any informed thoughts on the matter. I'm just about to make a stove of the catering oil can size(which is what we will make on the course). I'll then see how hot I can get it to see if the bricks melt in this larger stove.
                                                   Steven Offord.

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