| http://www.w3.org/ns/prov#value | - Core 2 is a 1.580??? core that comprises polybutadiene (Shell 1220, manufactured by Shell Chemical and NEOCIS BR40, manufactured by Enichem Elastomers), styrene-butadiene rubber (SBR 1502, available from Hules Mexicanos, or from Goodrich Rubber Company as ???Ameripol??? 1502) zinc diacrylate, free radical initiators (VULCUP 40KE (bis (t-butylperoxy) diisopropylbenzene) and VAROX 231XL (1,1-di(t-bu
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