Graphite electrode There are four types of graphite electrodes : carbon, np, pi grade, hp, and uhp. 1) diameter: 100600mm(4s24s) 2) grade: rp, hp, shp, uhp 3) packing: wooden crates with steel straps 4) characteristic: A. Superior electric conductivity B. Superior thermal conductivity C. Oxidation & corrosion resistance in high temperature D. Low ash content E. High bending strength F. Reasonable price Wooden crates with steel straps