carbon additive 1. High carbon content:90%, 92%,95% 2.Factory directly offer ... by replacing the traditional pertroleum coal of carburant.Also can improve the Carbon content in steel-melting and Ductile iron ... qualification certificate and the right for carbon export. •Service we can supply the carbon additive with 90%,92%,93% and 95 ... many foreign countries in Europe,America,and Asia. carbon additive