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 907 is a cast copper-tin alloy (tin bronze) recommended for severe service requirements. It is used widely for bearings and gears. It is a standard alloy for the manufacture of cast gear blanks and has long been known as Phosphor Gear Bronze.