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.ALCAN 28S is a free-cutting alloy having good mechanical properties. It responds to an age-hardening heat treatment and is designed primarily for screw machine products.