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.Sterling Silver (Silversmiths grade) contains a minimum of 92.50% silver; the standard grade contains a minimum of 92.10% silver. Historically the remainder was unrestricted but copper was (and is) used because it is more desirable, in general, than other metals. Also, copper is a more effective hardener than other metals that have been considered; however, copper lowers the melting point substantially and lowers the electrical and thermal conductivities appreciably. Sterling Silver is used for flat and hollow tableware, various items of jewelry and special industrial applications.