Nodular Pig Iron is used in the manufacture of ductile [also known as nodular or spheroidal graphite - SG] iron castings. High Silicon Nodular Pig Iron is used as a high purity furnace charge addition and Low Silicon Nodular Pig Iron is used as a high purity furnace addition for the production of Ductile Iron. The Pig Iron contains low levels of carbide stabilisers and an absence of other deleterious trace elements. Nodular Pig iron, is a type of cast iron characterised by spherical graphite nodules in the microstructure. Due to this structure, nodular pig iron offers special properties, like increase of yield strength and tensile strength.