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It is "boiled down" to the Super Metal, Compacted Graphite Iron Compacted Graphite Iron (CGI) provides at least 75% higher tensile, 40% higher stiffness and approximately double the fatigue strength of conventional grey cast iron or aluminium alloys. The fatigue strength of CGI is up to five times higher than that of aluminium at elevated temperatures. In comparison to ductile iron, CGI provides superior castability, thermal conductivity and machinability. These combined properties of CGI offer cost-effective solutions for complex components that are subjected to mechanical and/or thermal loading