Abstract
The load‐bearing characteristics of commercial superduty, high duty, and siliceous fire‐clay classes of refractories were studied and the results discussed in terms of optimum testing methods and possible service applications. Standard 9‐in. straights were tested, using an electrically heated (Globar) furnace designed to permit simultaneous testing of two brick placed on end. The brick were subjected to a load of 25 lb. per sq. in., and the continuous vertical linear change was measured with revolving‐drum kymographs. The brick were tested under the following conditions (a) 11/2‐hour hold at 2460°F., (b) 24‐hour hold at 2400°F., (c) 100‐hour hold at 2200°, 2400°, and 2500°F., and (d) 500‐hour hold at 2200°F.
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