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
1100°C 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 1300°C. 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
1160°C and Rockinghamware at 1020°C, low solubility lead
glazes at 1080°C 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.