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. C72500 is a tin-bearing cupronickel. It has excellent hot and cold working characteristics. It is highly resitant to seawater corrosion.