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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 12  1953
STONEWARE AND ROCKINGHAMWARE FROM BANARAS WATER WORKS AND BOWENPALLY (HYDERABAD-DN) PLASTIC CLAYS
A. V. RAJESWARA RAO, D. K. PATWARDHAN AND H. N. ROY
Pages : 130-145
DOI : 10.1080/0371750X.1953.10877616
Abstract
Properties of low fusible plastic clays from the Banaras Water Works and Bowenpally village (Hyderabad State) have been studied. Stoneware trials were conducted out of a mixture of Jabalpore fire-clay and the fusible clay as a flux. Water Works clay can stand upto a temperature of 1100C and has a very short range of vitrification. Addition of fireclay to Water Works clay upto 3 : 2 has no effect on widening the range of vitrification of the body. The ideal ratio for good stoneware bodies lies around 2 : 1. If the fireclay content is further increased the body mixtures become too refractory and the bodies are porous even when fired to 1300C. Bowenpally clay is highly plastic and sandy in nature, but has poor drying property and also produces specking and dunting. It had to be mixed with a lean clay and fired just below the vitrification of the mixt:.tre to avoid these defects. Leadless glazes for stonew:ue at 1160C and Rockinghamware at 1020C, low solubility lead glazes at 1080C which are erne-proof and citric acid re~istant have been developed. This investigation was taken up to find out the utility of low fusible red burning clays iu the manufacture of stoneware and Rockinghamware. Two such clays were taken, one is sedimentary clay deposited in the settling tank of the Water Works at Banaras. This clay is of a uniform composition, fine particle size, and can be used directly without any processing.
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