TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The content of hindered amine-type ultraviolet stabilizer, benzophenone-type ultraviolet absorber, organic peroxide and crosslinking agent with respect to 100 parts weight is 0.01-0.1 parts weight, 0.2-5 parts weight, 0.01-5 parts weight and 0.1-5 parts weight, respectively. The benzophenone-type ultraviolet absorber is chosen from 2-hydroxy-4-methoxy benzophenone, 2-hydroxy-4-methoxy-2'-carboxy benzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-n-dodecyloxy benzophenone, 2-hydroxy-4-n-octadecyloxy benzophenone, 2-hydroxy-4- benzyloxy benzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2-hydroxy-5-chloro benzophenone, 2,4-dihydroxy benzophenone, 2,2'-dihydroxy-4-methoxy benzophenone, 2,2'-dihydroxy-4,4'-dimethoxy benzophenone and 2,2'-4,4'- tetrahydroxybenzophenone. The fatty acid amide is chosen from lauric acid amide, palmitic acid amide, stearic acid amide, erucic acid amide, behenic acid amide, ricinoleic acid amide, hydroxystearic acid amide, N-oleyl palmitic amide, N-stearyl erucic acid amide, ethylene-bis capric acid amide, ethylene bis-lauric acid amide, ethylene bis-stearic acid amide and ethylene bis oleic acid amide. The flame retardant is chosen from ammonium polyphosphate, polyene acid amide and triaryl phosphate. The organic peroxide is chosen from 3-butylperoxy isopropyl carbonate, 3- butyl peroxyacetate, 3-butylperoxy benzoate, dicumyl peroxide, bis(3-butylperoxy)hexane, di-3-butyl peroxide, 2,5-dimethyl-2,5-bis hexyne, 1,1-bis(3- butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-bis cyclohexane, methylethylketone peroxide, 2,5-dimethylhexyl-2,5-bis peroxybenzoate, 3-butylhydroperoxide, menthane hydroperoxide, benzoyl peroxide, chlorobenzoyl peroxide, 3-butylperoxy isobutyrate, hydroxyheptyl peroxide and cyclohexanone peroxide. The silane coupling agent is chosen from 3-methacryloxypropyl trimethoxysilane, aminopropyltrimethoxysilane, aminopropyl methyldimethoxysilane, aminopropyltriethoxysilane, glycidoxy propyltrimethoxysilane and methacryloxypropyltrimethoxysilane. The crosslinking agent is chosen from triaryl isocyanurate, triaryl cyanurate, divinylbenzene and trimethylolpropane trimethacrylate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The composition further contains 0.1-1 parts weight of 10-20C fatty acid amide, 0.01-0.5 parts weight of phosphate flame retardant and 0.1-2 parts weight of cross-linking agent. The ethylene copolymer is chosen from ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-isobutyl acrylate copolymer, ethylene-n-butyl acrylate copolymer, ethylene-acrylate copolymer, ethylene-methacrylate copolymer and ethylene-isobutyl acrylate-methacrylic acid copolymer. Preferred Properties: The ethylene copolymer has vinyl acetate content of 25-35 wt.% and melt index of 15-50 g/minute. The sealing sheet has thickness of 0.01-1 mm.