Abstract
The so–called load test, as applied to refractory fire–clay brick, was studied from two points of view. The present A.S.T.M. standard test procedure is found to give results, on specimens smaller than the standard size, that depend on the cross section and length of the specimen. A more informative and more reliable test, constituting the second part of the study, consists in recording the curve of deformation against time at a constant temperature. The deformation of fire–clay brick at 2100° to 2550°F. is an exponential function of temperature, and the flow up to 24 hours fits the equation for flow of glass. At constant temperature, between 2100° and 2550°F., the permanent deformation after cooling is proportional to the load for the range 15 to 40 lb. per sq. in.
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