View Sample Alloy Digest Data Sheet (PDF)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.PYROMET* ALLOY CTX-909 exhibits a low and relatively constant thermal coefficient of expansion over a broad temperature range, high hot hardness and good thermal fatigue resistance.