THE REQUISITE CONSISTENCY FOR A CASTING SLIP1

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Abstract
Producing desirable flowing quality in a slip is proposed as a means of controlling its casting quality. A conception of plastic flow as a property incapable of being measured in terms of an absolute unit such as may be applied to viscosity measurement is presented and a simple gravity flow tube consistometer of suitable dimensions for obtaining comparative tests upon casting slips or upon similar suspensions is described.Only sufficient data are presented to aid in explaining or describing general principles or conceptions, to suggest means of obtaining desirable plastic flow and to show what the consistency of a vitreous sanitary ware casting slip now in use actually is. Stiffness, yield value, and starting pressure are regarded as the elements making up plastic flowing quality and it is necessary to take all three of these factors into account in order to specify the kind of flow obtained. The consistency of a casting slip which will produce good solid cast ware, described in terms of the test apparatus used in connection with this work, may be stated as follows: stiffness equals 60 cm. per cc. per sec.; yield value equals 20 cm.; plasticity ratio equals 2.5. Reference has also been made to the application of these Same principles to the control of glaze slips and to the testing of clays to determine their suitability for use in any process involving their plastic working properties

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