... 3-8mm,5-10mm or as per customer’s requirement. Carbon raiser graphite petroleum coke:GPC/Graphitized Petroleum Coke 1. High ... carbon low sulphur 2. High absorptive 3. No residuegraphite petroleum cokein ... left, save production cost.1, Usage: used to improve the Carbon content in steel-melting and Ductile iron foundry2, Characteristic: high ...