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.ALUMINUM 6951 is a heat treatable alloy supplied in clad condition on one or both sides for brazing applications. The clad sheets or plates for brazing are designated as No. 21, No. 22, No. 23, and No. 24.