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.WRM alloy 4252 is a modified copper-zinc-tin alloy similar to C42500 (see Alloy Digest Cu-280), with improved conductivity, strength, and forming properties.