The Testing of and a Specification for Glass House Pot Clays

JSGT_1934_V18_T128_T142

The causes of failure of glass melting pots are enumerated and methods for assessing the resistance of clay mixtures to specific types of failure are briefly described. The behaviour of pots in service is correlated with the results of the laboratory tests enabling a specification to be compiled based upon certain physical properties of the clay rather than upon its chemical composition. One of the most tedious tests in this connection is that of determining the limiting creep strength of the clays and new apparatus is described for this purpose. It is shown that the limiting creep strength at high temperatures is affected most markedly by an increase in temperature and by the proportion and character of the grog particles. There appears to be no obvious relationship between the limiting creep strength and either the ultimate strength or the temperature at which rapid extension occurs on the temperature–extension curve determined at constant load.

J. H. Partridge