graphite electrode with grade RP, RPI, HP, UHP used for arc furnaces Graphite Electrodes:-grade:RP, RPI(HD), HP, UHP-dia. 75-600mm; ... .82.2Ash% ≤0.40.30.30.20.3*male-female graphite electrodes: we can produce other grade also according to customer ... requirements.*we can produce to meet with customer’s requirements. Graphite Electrodes with grade RP RPI HP UHP