Abstract: An improved capping board is disclosed, for supporting electrodes immersed into an electrolytic cell. This capping board is molded from a plastic resin selected from the group consisting of polytetrafluoroethylene and acid resistant polyester, vinylester, epoxy and phenolic resins. It contains from 3 to 30% by weight of glass fibers, from 2 to 10% by weight of silica, from 2 to 10% by weight of mica and from 2 to 40% by weight of silica rocks, as well as one or more embedded filling bars. Advantageously, such bars are obtained by pultrusion of fibers, preferably glass fibers with a resin, preferably a low curing polyester resin, and they are coated with a surface layer of a resin bonding agent, preferably a silane. The resulting capping bar is more rigid and not subject to overall length curving and shrinkage as are the known capping boards filled with wooden cores.

Abstract: A non conductive, edge-strip for use on an electrolytic metal refining anode or cathode to prevent metal deposit problems over the edge contours of this cathode. The edge-strip is in the shape of an elongated profile member with a U-shaped cross-section sized to extend over, and fit snuggly onto an edge of the cathode. The edge-strip is made by pultrusion of fiberglass impregnated with a polymeric resin resistant to acids and alkalis, and externally covered with a surfacing veil resistant to acids and electrochemical attacks.

Abstract: A capping board made of plastic material reinforced with fiberglass, for supporting the ends of a plurality of electrodes immersed in an electrolytic cell such as the cells used for the electrolytic refining of copper. This capping board is made of a plastic resin selected from the group consisting of polytetrafluoroethylene and acid resistant polyesters, vinylesters, epoxy and phenolic resins, and contains from 10 to 20% by weight of fiberglass, from 2 to 10% by weight of silica, from 2 to 10% by weight of mica and from 2 to 10% by weight of feldspar. Preferably, at least one wooden core is embedded in the capping board in order to reduce the quantity of resin required and the fabrication cost. Such capping boards made of reinforced plastic material allow for substantial increase in the productivity of electrolytic metal refining plants, in particular because they are resistant to corrosion and do not need to be frequently replaced.