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.SILICON NITRIDE SN-220 has found its niche in industrial applications in engine and gas turbine components. It has excellent high-temperature strength and thermal shock resistance.