during the casting process may be maintained at a temperature level sufficient to insure suitable fluidity thereof but insufficient to cause an adverse heat effect on the support and first electrode examples of materials suitable for use in the formation of the insulation layer are listed below with the addition of suitable casting temperature ranges written in parentheses polyolefins 140 u00b0 c 320 u00b0 c such as polypropylene 190 u00b0 c 290 u00b0 c and polybutylene 140 u00b0 c 190 u00b0 c methyl pentenes 270 u00b0 c 320 u00b0 c eva resins 180 u00b0 c 220 u00b0 c as resins 180 u00b0 c 290 u00b0 c methyl methacrylate styrene copolymers 170 u00b0 c 260 u00b0 c polyarenes such as polystyrenes 180 u00b0 c 270 u00b0 c polyethylene terephthalates 270 u00b0 c 320 u00b0 c polyesters 220 u00b0 c 410 u00b0 c methyl polymethacrylates 160 u00b0 c 260 u00b0 c polycarbonates 280 u00b0 c 300 u00b0 c polyacetals 180 u00b0 c 240 u00b0 c polyphenylene ethers 220 u00b0 c 350 u00b0 c polyallyl ether ketones 380 u00b0 c 430 u00b0 c polyether ketones 350 u00b0 c 400 u00b0 c thermoplastic polyimides 340 u00b0 c 425 u00b0 c polyacrylonitriles 180 u00b0 c 210 u00b0 c polyamideimide resins 320 u00b0 c 370 u00b0 c polyether imides 340 u00b0 c 430 u00b0 c polyamides 230 u00b0 c 300 u00b0 c polyurethanes 220 u00b0 c 270 u00b0 c fluororesins 180 u00b0 c 310 u00b0 c such as pctfe polychlorotrifluoroethylene and polyvinylidene fluoride polyvinyl chlorides 150 u00b0 c 210 u00b0 c polyvinylidene chlorides 150 u00b0 c 200 u00b0 c chlorinated polyethylenes 150 u00b0 c 200 u00b0 c polysulfones 330 u00b0 c 400.