To minimize {HEAD ~ these performance deficiencies} in {TAIL ~ materials} used to limit air permeability, special material formulations have been developed that comprise, preferably, an amorphous polyurethane based elastomer/rubber alloy 
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To minimize { HEAD ~ these performance deficiencies } in { TAIL ~ materials } used to limit air permeability , special material formulations have been developed that comprise , preferably , an amorphous polyurethane based elastomer / rubber alloy
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