described is a degradation - resistant electrode for an electrochemical reaction comprising an electrically conductive plastics complex material comprising 18 to 50 wt . percent of the polyolefin polymer , 1 to 25 wt . percent of the electrically conductive carbon black and 25 to 75 wt . percent of one or more of graphite , calcium carbonate , talcum , alumina , silica and titania .