FIRED HOLLOW CERAMIC SPHEROIDS

摘要

FIRED HOLLOW CERAMIC SPHERIODS A hollow, ceramic macrosphere or spheriod comprising a relatively smooth outer skin and cellular shell is produced in the 2-20 mm diameter range with specific gravities in the 0.2 - 1.2 range. The spheriods can be rendered inert to water and are stable at temperatures of 800 to 1000.degree.C, depending on their composition. The porosity of the shell can be controlled through various additives and/or epoxy resin coating. The spheriods may be made from common clay and sodium silicate.