Abstract
A knowledge of the properties of American whiting as compared with those imported from England is of importance to producers of the American material as well as to manufacturers of products in which whiting may be used. Twenty-two samples of domestic and foreign whiting have been submitted to examination and tested as follows: (1) visual examination, (2) microscopic examination, (3) determination of fineness of grain by three methods, (4) partial chemical analysis, (5) effect of the different whitings on the softening point of ceramic cone mixtures, and (6) effect on rate of vitrification of porcelain bodies. The results indicate that although the English whitings contain considerably more fine material of a colloidal nature, the American whitings appear to be sufficiently fine grained for all ceramic purposes. This extreme fineness may play a part in assisting in the flotation of the frit in glazes containing a low percentage of clay, but apparently has no effect in the fluxing point of ceramic glaze or body mixtures. Sufficient data has been obtained to permit of the preparation of tentative specifications for whiting for ceramic purposes and the main requirements of such a material are given.
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