TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The inorganic particulates are calcium carbonate, titanium dioxide, kaolin and clays, alumina trihydrate, talc, silica, antimony oxide, magnesium hydroxide, barium sulfate, mica, vermiculite, alumina, titania, wollastonite or boron nitride. The metal layer is metal foils, sputtered metal layers or metal oxide layers.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The back-sheet further comprises 10-70 wt.% of inorganic particulates. The first polymer film comprises 25-90 wt.% of chlorosulfonated polyethylene, and 5-35 wt.% of adhesive comprising thermoplastic polymer adhesives, thermoset polymer adhesives or rosin based tackifiers. The first polymer film comprises a single layer back-sheet having first and second opposite side, where the first side of the polymer film is adhered directly to the encapsulant layer and the second side of the first polymer film is exposed. The first polymer film has a thickness of 10-50 mils. The second side of the first polymer film is adhered to a second polymer film or a metal layer. The second polymer film is a polyester film or a fluoropolymer film. The second polymer film is a film consisting essentially of fluoropolymer comprising polyvinyl fluoride, polyvinylidene fluoride, PTFE or ethylene-tetrafluoroethylene. The chlorosulfonated polyethylene has a weight average molecular weight of 75000- 300000. The adhesive of the first polymer film comprises at least one rosin based tackifiers. The adhesive of the first polymer film comprises an ethylene copolymer. The ethylene copolymer comprises ethylene vinyl acetate. The ethylene copolymer is ethylene-methyl methacrylate copolymer, ethylene-ethyl methacrylate copolymer, ethylene-propyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propyl acrylate copolymer and/or ethylene-butyl acrylate copolymer. The ethylene copolymer is formed by the polymerization of ethylene and at least one co-monomer comprising methyl methacrylate, methyl acrylic ester, ethyl methacrylate, ethyl acrylic ester, propyl methacrylate, propyl acrylic ester, butyl methacrylate, butyl acrylic ester, methacrylic acid glyceride, methyl hydrogen maleate, ethyl hydrogen maleate or maleic anhydride. The chlorosulfonated polyolefin is an elastomer or a synthetic rubber. The chlorosulfonated polyolefin is a chlorosulfonated polyethylene of formula (-((CH2-CH2-CH2-CH(-Cl)-CH2-CH2-CH2)n-CH(-SO2-CL)))m-).m, n = 5-25.