TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The seal comprises ethylene/acrylic polymer, fluoro elastomer and/or ethylene propylene terpolymer, flexible or rigid epoxy resin, thermoplastic elastomer, such as polyester elastomer. The curable seal material used in formation of seal contains (wt. pts) polydiorganosiloxane containing two or more silicon-atom-bonded alkenyl groups in each molecule (100), reinforcing filler (5-50), oxide or hydroxide of alkaline earth metal with atomic weight of 40 or more (1-20), an organohydrogensiloxane, and platinum-group metal catalyst (0.1-500 wt. pts of platinum-group metal per 1 million wt. pts of polydiorganosiloxane). The curable seal material further contains, optionally, an organic peroxide (0.1-5), an inhibitor (0.01-5) and non-reinforcing extended filler (0.01-100). EXAMPLE - Polydimethylsiloxane (in wt. pts) (100) containing 40 mol.% of methyltrifluoropropyl and dimethyvinylsiloxy terminal, amorphous fumed silica (39) treated with hexamethyldisilazane (6.6), and hydroxy-terminated dimethymethylvinylsiloxane (1) were blended together. Then, the blended mixture was heated to remove volatile matter, and treated under vacuum to obtain a base material.    Polydimethysiloxane (11), 1,3-diethenyl-1,1,3,3-tetramethyldisiloxane platinum complexes (5), and decamethylcyclopentasiloxane (2.9) were added to base material, and the mixture was blended to obtain a flowable silicone paste (A).    Polydimethyl siloxane (100), hydroxy-terminated dimethymethylvinylsiloxane (1) and fumed silica (38), treated with hexamethyldisilazane (6.3) were blended together. The blended mixture was heated to remove volatiles, to form a base material.    The obtained base material was diluted with polydimethylsiloxane (10), then dimethyl hydrogensiloxy-modified silica (38) and 1-ethynyl-1-cyclohexanol (inhibitor) (0.2) were added and blended together to obtain a flowable silicone paste (B).    Silicone pastes (A) and (B) were mixed in ratio of 50:50, press molded and post-cured for 4 hours at 200degreesC to obtain a cured elastomer. The elastomer had shore A hardness of 42 according to ASTM D2240, tensile at break of 900 psi and elongation at break of 420% according to ASTM 412.