Castable refractory any experiences with Ciment Fondu
50 photos I m planning on making a furnace along the lines of that described by Michael Cox in MEW 181 and on his website LINK . Michael s recipe for the castable refractory calls for a mix of Perlite, clay cat litter and Portland Cement in dry volume ratio 7 1 1.
Replacing used perlite with new media to raise successive crops is costly, and recovering the expense by selling the product at a higher price may not work well in a competitive market. Steam sterilization of used perlite before planting a new crop has been recommended to safeguard against pathogen contamination .