... grade RP, RPI, HP, UHP used for arc furnaces Graphite Electrodes:-grade:RP, RPI(HD), HP, UHP-dia. 75-600mm; length ... : 3TPI, 4TPI, 4TPI long;-high conductivity-high bulk density-low electrical resistance-low ash-good resistant of oxidation,heat shock & impact-competitve ... .2Ash% ≤0.40.30.30.20.3*male-female graphite electrodes: we can produce other grade also according to customer’s ...