Graphite electrode is a major conduction materials used in the electric smelting industry, as the electric arc furnace (LAF) and ladle furnaces (LF) smelting steel, the submerged-arc furnace producing ferroalloy, pure silicon, phosphor, matte, calcium carbide, ect. , and the electric resistance furnace as graphitization furnace producing graphite electrode, glass melting furnace, electric furnace producing carbofrax, ect. There are three type graphite electrodes, NP (RP), HP, UHP, with corresponding 4 & 3 thread per inch (TPI) Nipples to suit.