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.Copper Alloy No. 857 is a free-machining copper-zinc-tin-lead alloy for castings. It is characterized by its pleasing yellow color, good machining and polishing characteristics, and its relatively low cost. It has only moderate strength and is used in light-duty applications such as plumbing goods, valves and ornaments.