My cast refractory consists of 4 parts:
Perlite
Silica Sand
Portland Cement
Fireclay*
*due to funds at the time, I could not afford actual fireclay, so i opted for regular clay... this was a big mistake i found out... my forge is capable of reaching 2300*F, but holding it at those temperatures is destroying it... the ceiling part around the burner inlets is melting off, leaving dangerous hotspots on the top of the forge.
(click image for video!)
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