| http://www.w3.org/ns/prov#value | - This invention provides for a composition including an elastomer having at least 30 mol % of isobutylene; carbon black having a surface area of less than 30 m2/g and a dibutylphthalate oil absorption of less than 80 cm3/100 gm; and polybutene oil having a number average molecular weight greater than 400.
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