The coating of these electrodes consists mainly of cellulose integrated with ferroalloys (magnesium and silicon). The coating gasifies almost completely, thus allowing welding also in a vertical descending position, which is not allowed with other types of electrodes; the high gasification of the cellulose reduces the amount of slag present in the weld. The high development of hydrogen (deriving from the particular chemical composition of the coating) causes the weld pool to be "hot", with the melting of a considerable quantity of base material; in this way welds are obtained which penetrate deeply, with little slag in the bath.
The mechanical characteristics of the welding are excellent.