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AN INVESTIGATION OF TWENTY‐ONE SASKATCHEWAN BALL CLAYS 1
Author(s) -
Worcester W. G.
Publication year - 1929
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1929.tb18062.x
Subject(s) - ball (mathematics) , raw material , shrinkage , porosity , mineralogy , geology , materials science , geotechnical engineering , composite material , mathematics , chemistry , mathematical analysis , organic chemistry
Twenty‐one Saskatchewan ball clays have been investigated; the study covers in a general way their chemical, raw, and fired properties. The information presented will no doubt prove of immediate interest to the ball clay trade and especially to the Saskatchewan shippers and exporters. In general, the more outstanding properties of the clays studied are raw strength, fired color, craze resistance, and rate of vitrification. Their raw strength is remarkably high, greater than that of any similar clay on the market at the present time. One clay developed the exceptional raw strength, though diluted with 50% potters’ flint, of over 1000 lbs. per square inch, a second one 938 lbs., while the average of the eleven highest is 812.8 lbs.; clays of such high strength should prove of interest to the trade where it is desirable to reduce losses in the raw and bisque state. A number of the clays tested are outstanding as ball clays in that they fire white or nearly so up to and including cone 12, the purity of whiteness being equal to that of white firing china clays. The porosity and fired volume shrinkage of the Saskatchewan clays correspond more nearly to those of the English ball clays than do the Tennessee‐Kentucky clays as studied by Sortwell.