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.BUNTING Alloy 923 is a cast copper-tin-lead-zinc alloy that possesses a good combination of machinability, strength and resistance to corrosion. It is known also as 87-8-1-4 alloy or Leaded G Bronze. It withstands gas or liquid pressures quite successfully. Its numerous applications include valves, gears and bushings.