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.MUELLER Alloy 6680 is a non-leaded copper-base alloy (manganese bronze) with relatively good ductility and fair machinability. It can be used with soft or hard mating members where moderate strength is sufficient. It can be joined successfully by silver soldering or soft soldering. Its many uses include bearings, gears, pump parts, connecting rods, marine hardware and bushings.