TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: Organic peroxide is benzoyl peroxide, dicumyl peroxide, or peroxide-2,2-ethylhexylcarbonate tert.-butyl ester.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: Fluorine-containing polymer with curable functional groups is copolymer if fluorinated monomer e.g. tetrafluoroethylene, chlorotrifluoroethylene, perfluoroalkyl vinyl ether, vinylidene fluoride, and/or hexafluoropropylene and monomer containing curable functional group e.g. hydroxyl, carboxyl, amino, epoxy, and/or isocyanate. Aliphatic isocyanate curing agent is 1,6-hexamethylene diisocyanate trimer and/or isophorone diisocyanate trimer, and hydrogenated modified aromatic isocyanate is hydrogenated tolylene diisocyanate, hydrogenated diphenylmethane-4,4'-diisocyanate, and/or hydrogenated methylene diisocyanate. Weight ratio aliphatic isocyanate curing agent:hydrogenated modified aromatic isocyanate is 1:9-9:1. Mass ratio fluorine-containing polymer:isocyanate curing agent is 100:5-100:30. Fluorine-containing coating contains defoaming agent, flatting agent, antioxidant, dispersing agent, and/or UV-shielding agent e.g. UV light absorbers, carbon black, and/or titanium dioxide. Metallocene polyolefin is polymerization reaction product of ethylene metallocene catalyst and butene, hexene, and/or octene. Polyolefin resin contains 100 pts. wt. metallocene polyolefin, 0.1-2 pts. wt. organic peroxide, 0.1-2 pts. wt. auxiliary crosslinking agent e.g. trimethylolpropane trimethacrylate, triallyl isocyanurate, and/or triallyl cyanurate, and 1-10 pts. wt. titanium pigment. Insulating substrate layer is polyethylene terephthalate or polyethylene naphthalate. Preferred Parameters: Thickness of cured fluorine-containing polymer is 15-40 mu m, thickness of insulating substrate layer is 90-300 mu m, and thickness of moisture-proof layer is 25-300 mu m. Preferred Conditions: Extrusion temperature is 60-100 degrees C, roll-forming is performed in vacuum at 100-130 degrees C, and curing temperature is 110-130 degrees C.