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.ALUMINUM 355 is a heat treatable aluminum alloy containing silicon and copper as the major alloying elements. It is recommended for light weight, high strength, pressure tight castings.