Wallace-murray Corporation

Rudolph A Skriletz

Virgil D Kendall

A method of restoring the fluid permeability of the surface of the mold face of a used, ceramic, fluid-release mold body which has become fouled with accumulated silicate material from the plastic clay composition formed by the mold, comprising treating the fouled surface with a fluorine containing acid such as fluosilicic acid, or hydrofluoric acid.

Method of restoring the fluid permeability of a used, ceramic

A fluid-releasable mold for forming shaped ware including a porous mold body comprising at least 70% alumina, up to 15% ball clay and up to 15% talc is disclosed. A mold face is formed on one surface of the mold body and fluid-permeable conduit is provided in communication with a second surface of the mold body with means for sealing the fluid-permeable conduit to the second mold body surface to prevent the escape of fluid from the conduit other than through the mold body and out the mold face. The arrangement obviates the problem of gradual loss of porosity which has heretofore limited the service life of fluid-release molds of alumina, ball clay, and talc.

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Marysville, OH, United States of America

Rudolph A Skriletz