PHOSPHATE CONTAINING BONDING SYSTEM PROVIDES IMPROVED REFRACTORY GUNNING MIXES.

A phosphate-containing bonding system for refractory gun mixes is claimed to provide a more versatile mix with better water range. Using any alkali metal phosphate bond with predictable results, low temperature strength is obtained as opposed to a ceramic bond, in the mix. An improved refractory gun mix is obtained with a composition consisting essentially of form 0. 5 to 5% bentonite, from 1. 5 to 10% pitch, the balance being sized refractory aggregate, when bonding system is from 1 to 5% alkali metal phosphate and from 0. 5 to 5% aluminum sulfate.