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. 903 is a cast copper-tin-zinc alloy known also as G Bronze or 88-8-0-4 alloy. It has a good combination of strength and corrosion resistance and is often used in castings subject to liquid or gas pressures. Among its many uses are valves, pumps, bushings and gears.