| http://www.w3.org/ns/prov#value | - In a one embodiment, a single layer core composition is made wherein rubber such as polybutadiene is present in an amount of about 100 phr, zinc diacrylate is present in an amount of about 40 phr, zinc oxide is present in an amount of about 5 phr, barium sulfate is present in an amount of about 5 to 20 phr, peroxide is present in an amount of about 2.2 phr, an antioxidant is present in an amount o
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