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.KEVLAR 49 is a high-modulus para-aramid reinforcing fiber. It is the dominant organic reinforcing fiber in advanced composites today. It has exceptional strength and stiffness and it is a low density material.