Selection criteria of lustrous carbon carriers in the aspect of properties of greensand system

Carbonaceous additives have often been regarded as problem ones to solve and improve the surface finish of iron castings, but at the same time they cause other issues such as increased loss on ignition, total fines and moisture in greensand systems. With the correct selection of carbonaceous additive, the combination of low ash, high volatile and lustrous carbon content coupled with the key element grading size, ensures that produced castings are free from metal penetration and surface related problems.