William & Susan Schran User on sun 16 oct 05
I use a mix, by volume, of 1/3 each of the following materials to make
pedestals for crystalline glaze firing: alumina/kaolin/sawdust.
This "pedestal mix" replaces soft firebrick and clay pedestals. This mix
stands up to glaze melting all over it and doesn't break down/melt.
I use them both dry and fired, doesn't seem to matter.
They also don't shrink very much.
Perhaps this might be alternative to wasters or pieces of broken shelves.
William "Bill" Schran