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.APEX 12 is a non-heat treatable sand casting alloy, while APEX 12PM is a non-heat treatable permanent mold casting alloy. They are recommended for general purpose castings requiring moderate strength and corrosion resistance.