1\standard potential magnesium anodes To be used in soils with resistivity lower than 2000 ª+/cm To minimize the cost. Be cheaper than high potential magnesium anodes Electrochemical properties 2\mg high potential anodes To be used in soils with resistivity more than 2000 ª+/cm As per astm b843 industry standard Electrochemical properties 3\mg extruded ribbon anodes