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 4640 (formerly MBCo Alloy 203) is a classic marine alloy known as Naval Brass. It contains nominally 0.75% tin which has made it the most widely used marine alloy. It is suitable for both salt and fresh water applications.