TECHNOLOGY FOCUS - POLYMERS - Preferred Compound: The polyolefin is a polymer(s) from polypropylene, polyethylene or polypropylene-ethylene copolymer. The aromatic polymer is a polymer(s) selected from aramids, polyketones, polysulfones, polystyrenes, polybenzothiazoles, polybenzoxazoles, polybenzimidazoles, polyarylates, polyamide-imides, polyetherimides, polyphenylene sulfides, polyphenyls, polyquinolines, polyquinoxalines or preferably poly(phenylene oxides). The seal material is made from a mixture of polypropylene and poly(phenylene oxide).Preferred Component: The aromatic polymer comprises discrete phases in the polyolefin matrix. It comprises an impact modifier, which is a styrene/polyolefin block copolymer. The thermoplastic material comprises a compatibilizer comprising a block copolymer with a block(s) in which the first block end is soluble in the polyolefin and a second block end is soluble in the aromatic polymer.Preferred Composition: The polyolefin comprises not more than 95, preferably at least 50 wt.% of the thermoplastic material.Preferred Property: The thermoplastic material has a tensile creep deformation of 1-1000 hours at 114degreesF, under a constant load of 1500 pounds/square inch (psi), of 0-3%, as determined by american society for testing and materials ASTM D2990. It has a tensile modulus of 100000-400000, preferably 100000-250000 psi, as determined by ASTM D638, a coefficient of thermal expansion in the direction of flow of 0.000010-0.00020, preferably 0.000020-0.000060 inch/inch-degreesF, at 50% RH and 73degreesF, as determined by ASTM E831, a heat deflection temperature at 66 psi of 200-400, preferably 230-400degreesF, as determined by ASTM D648 and a tensile elongation to break of 20-350, preferably 30-200%, as determined by ASTM D638.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The electrolyte is an alkaline aqueous solution. The negative and positive electrodes comprise zinc and manganese dioxide, respectively. The electrolyte comprises a potassium hydroxide.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The electrochemical cell comprises a cover, a current collector (28) and a contact terminal (30). The cover is disposed in the open end of the container. The current collector is electrically connected to one of the electrodes and extends through an aperture in the seal to be electrically connected to the contact terminal. The seal forms a compressive seal between the container and the cover. It comprises a hub (38) that forms a compressive seal around the current collector and a pressure relief mechanism that ruptures to release internal pressure from the cell.