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.