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.NILO alloy 48 is a binary iron-nickel alloy used primarily for glass-to-metal seals. It is also used in thermostats up to 450 C (842 F).