... customers' use experience, FSK Carbon additive has gained the features of high carbon, low sulfur, low nitrogen and less impurities. FSK carbon additive can be used in ... 10 for you, Fixed carbon(max):95%,sulfur(max):0.3%2/ for low Nitrogen steel, Steel cord ,high strength wire-steel,we recommend ... special requirement about the packing, pls contact with us freely. High Carbon Low Sulfur Graphite Powder