... .Lower sulphur 0.05%max 3.High carbon good quality Calcined petroleum coke. As an ideal carbon additive and intermediate reactor, it has been ... foaming or in carbon adjustment, not mention the less costly and convenient. Graphite Petroleum Coke F.C(Min)98.50%98.50%98.00%S(Max ... .50%0.50%0.50%Size:0.5-1mm,1-5mm,5-10mm,3-8mm,ect. Graphite Petroleum Coke with low sulfur high carbon good quality