Compacted_graphite_iron
Compacted graphite iron (CGI), also known as vermicular graphite iron (GJV, VG,[1] JV[2] or GGV from the German: "Gusseisen mit Vermiculargraphit"[3]) especially in non-English speaking countries,[4] is a metal which is gaining popularity in applications that require either greater strength, or lower weight than cast iron.
R.D. Schelleng obtained a patent for the production of compacted graphite iron in 1965.[5]