>A stable high-temperature refractory cement was formulated from oxides and silicates of elements of the periodic group N. The name of the cement is Astroceram, and it comes in two different types: Type A, which can be air-dried and has a maximum service temperature of 4300 deg F, and Type B, which must be fired to achieve a bond but can be used up to 5300 deg F. Some of its thermal, nuclear, mechanical, electric, and chemical properties are described. It also has excellent radiation resistance. (D.L.C.)

DEVELOPING SPECIAL CEMENTS TO RESIST TEMPERATURES OVER 4000 F

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