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Fifty-one clays of the type used for saggers were studied with r espect to chemical composition and also with respect to various physical properties both before and after heating at different temperatures. The t ests indicated that certain clays had similar properties; consequently the later phases of the investigation were limited to 36 clays. Eighty-five sagger bodies were prep ared from these clays by blending equal weights of each of 2 clays and either a fine-graded grog or a coarse-graded grog. Various physical properties of th e bodies were determined after heating them at one of each of several t emperatures within the range in which saggers are used commercially so that 139 groups of la bora t or yprepared specimens of different properties were obta ined. Twelve commercially prepared bodies were also studied. The results obtained should enable the manufacturer to (1) produce saggers suitable for parti cular servi ces, and (2) predict the probable life with respect to resistance to thermal shock, if ccrtain propcrties of the constituent clays are known.

A study of sagger clays and sagger bodies