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NOTES ON TERRA COTTA GLAZE CONSISTENCY 1
Author(s) -
Spurrier H.
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.tb18088.x
Subject(s) - glaze , specific gravity , viscosity , ceramic glaze , viscometer , mineralogy , alkalinity , bottle , materials science , geology , chemistry , metallurgy , composite material , ceramic , organic chemistry
Some of the difficulties encountered in applying glaze to terra cotta are discussed. The use of a hydrometer to test glazes is misleading as a hydrometer supplies gravity indication only in true solutions and glazes are not true solutions; furthermore the viscosity of a glaze may obscure the real specific gravity. It is suggested that in order to Control a glaze it should first be made to a desirable specific gravity and then the desired viscosity at that gravity be ascertained by experiment. A viscosimeter and specific gravity bottle are suggested for this purpose. The effect of change of alkalinity and of bacteria together with the control of glaze wastage are also discussed.