TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Materials: The adhesive composition further comprises a cross-linking catalyst and a plasticizer. The cross-linking catalyst comprises organotin compound or a titanate. The plasticizer comprises a hydrocarbon oil, an ester derivative of a dibasic acid, a mineral oil, a paraffin, or a paraffin derivative.    TECHNOLOGY FOCUS - POLYMERS - Preferred Polymers: The low MVTR polymer or copolymer comprises polyisobutylene, isobutylene-isoprene copolymer, isobutylene-isoprene-divinylbenzene copolymer, chlorinated or brominated butyl rubber, isobutylene-brominated-p-methylstyrene copolymer, isobutylene-p-methylstyrene copolymer, chlorosulfonated polyethylene, ethylene-alkyl (meth)acrylate copolymer, acrylonitrile-butadiene copolymer, and/or polychloroprene. The silane-modified polymer or copolymer is crosslinked as a result of exposure to atmospheric oxygen or moisture. It comprises monomeric units of propylene. It may comprise a homopolymer of propylene or a copolymer of propylene and 2-8C alpha-olefin. It may comprise a copolymer of propylene and maleic anhydride or alkyl (meth)acrylate. The adhesive composition further comprises a crosslinking initiator capable of initiating cross-linking between silyl groups on the silane-modified polymer or copolymer. The silane-modified polymer or copolymer comprises silane-modified amorphous alpha-olefin polymer or copolymer, a silane-crosslinkable halogenated polymer composition, and a silane-grafted copolymer of a monoolefin and a vinyl aromatic monomer. The silane-modified polymer or copolymer is a silane-modified amorphous alpha-olefin polymer or copolymer comprising silyl groups having a structure -Si(OR1)n(R2)m.R1, R2 = 1-8C optionally branched alkyl;n = 1-3;m = 0-2;m+n = 3.The silane-modified polymer or copolymer is a silane-crosslinkable halogenated polymer composition comprising a mixture of 100 parts by weight halogenated polymer and 0.1-20 parts by weight amino group-containing silane compound having the structure RHNR'Si(OR)3.R = H, alkyl or phenyl;R' = alkylene;OR = 1-6C alkoxy or alkoxyalkoxy.The silane-modified polymer or copolymer may be a silane-grafted copolymer comprising at least50 mole% 3-7C monoolefin(s) and 0.1-50 mole% vinyl aromatic monomer(s), in which the silane has the structure RR'SiY2.R = monovalent olefinically unsaturated hydrocarbon or hydrocarbonoxy radical reactive with the free radical sites produced on the backbone polymer;Y = hydrolysable organic radical;R' = alkyl, aryl or Y radical.The plasticizer may be a polybutylene. The adhesive composition further comprises a tackifying resin. The tackifying resin comprises a rosin ester, a polyterpene, a polyterpene derivative, a 5C hydrocarbon resin, a 9C hydrocarbon resin, a phenolic resin, or a natural resin. Preferred Property: The adhesive composition has MVTR less than 3 (preferably less than 1) g/m2-day.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: The adhesive composition further comprises a filler and an adhesion promoter. The filler comprises calcium carbonate, talc, barium sulfate, clay, silica, carbon black, and/or titanium dioxide. The adhesion promoter comprises a silane, a titanate, a zirconate, or a zirco-aluminate.    TECHNOLOGY FOCUS - ELECTRONICS - Preferred Components: The solar panel comprises module wire openings extending through photovoltaic material layer of the backing panel and a module wire adhesive sealing the module wire openings, wherein the module wire adhesive has a different composition.