carbon additive 1. High carbon content:90%, 92%,95% 2.Factory directly offer ... Factory •Experience More than 20 years experience in producing Additive Carbon and 10 years in exporting. Our factory has been ... qualification certificate and the right for carbon export. •Service we can supply the carbon additive with 90%,92%,93% and 95 ... foreign countries in Europe,America,and Asia. coke carbon additive