Thanks, but I don’t think I explained myself well enough. Any kind
of fibrous or crumbly or non-rigid (solid, stiff !) board is not made
from the material I’m seeking. What I have (and want more of) is a
fired ceramic that was first a slurry that was foamed before firing.
The result is light, very porous, absolutely not fibrous. It’s
brittle, as 1/2" thick (6" x6" squares) will break apart if dropped,
likea piece of thin tile. Vey strong though, as I can place a pound
or two of steel dies on one and grab it by the corner with pliers
and escprt the whole stack into the kiln. You can do that with a hard
ceramic honeycombboard (I saw at Indian Jewelers Supply yesterday),
or solid, hard, (and very dense, heavy) ceramic boards I’ve also
used, but not any of the fibrous ceramic products I’ve seen.
No biggie; I’ll find it. ‘Foamed Ceramic’, I shall ‘search’ for