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Since 1952, Alloy Digest has been the leading reference for materials property data on metals and alloys used throughout the world. Featuring graphs, charts and tables, these sheets give facts and figures on composition or characterization, physical and mechanical properties, heat treatment, and machinability.

TOPHEL-NIAL are nickel-base alloys that were developed to provide industry a type K thermocouple in which each leg possesses an adherent, tenacious, black oxide with high emissivity for rapid temperature response. Its EMF-temperature relation is in accordance with NBS Circular 561. Consequently, TOPHEL-NIAL can be used on any existing instrument calibrated for a type K couple. Its stability of E.M.F. is equivalent, or better, than that of other type K thermocouples. TOPHEL and NIAL are suitable for temperatures up to 23000 F.