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.ILLIUM 98 is a machinable, nickel-base casting alloy, highly corrosion resistant to many media. While originally designed for hot sulfuric acid service, it has proven to be an extremely wide range corrosion resistant material.