METHOD OF MAINTAINING THE FLUID PERMEABILITY OF A FIRED ALUMINA, BALL CLAY AND TALC FLUID-RELEASE MOLD

摘要

A method of maintaining the fluid permeability of a fired ceramic mold body comprising at least 70 percent alumina, up to 15 percent ball clay and up to 15 percent talc wherein accumulated colloidal material which clogs the surface of the mold face is removed by abrading the mold face. The preferred manner of carrying out the invention is to sandblast the mold face.