the surrounding environment for example where the electrode may be subjected to elevated temperatures use of a polymer having a high melting or softening point is indicated in corrosive environments polymers having good resistance to the chemicals involved will be employed an electrode of varying susceptibility to wetting by the electrolyte may be obtained by using more or less hydrophobic polymers thus it will be seen that many classes of polymers are useful in the present invention particularly useful owing to their relative thermal stability and excellent chemical resistance are the fluorocarbons such as polyvinyl fluoride polyvinylidene fluoride polytetrafluoroethylene polyhexafluoroethylene and polychlorotrifluoroethylene also useful are the various acrylics such as polymethyl methacrylate phenolics such as phenolformaldehyde polyethylene polystyrene polyacrylonitrile acrylonitrile vinyl chloride copolymer polyvinylidene chloride polyesters polyimides polymercaptans polysulfones polycarbonates and the like the amount of ruo 2 iadd or other platinum group metal oxide iaddend used per part by weight of polymer varies with the application intended and the properties desired but generally is within the range of 6 1 1 in most instances the ruo 2 polymer composition will be used as a coating on a substrate in which case the amount of coating applied per square foot of substrate will likewise vary with the intended application and also with the ruo 2 polymer weight ratio obviously since ruo 2 adds electrical conductivity and catalytic properties the higher the weight ratio the more conductive the resultant coating therefore thicker coatings may be applied of the lower resistance high ruo 2.