| http://www.w3.org/ns/prov#value | - Heavy weight fillers for use with metallocene catalyzed polyolefins include titanium, tungsten, aluminum, bismuth, nickel, molybdenum, iron, steel, lead, copper, brass, boron, boron carbide whiskers, bronze, cobalt, beryllium, zinc, tin, metal oxides including zinc oxide, iron oxide, aluminum oxide, titanium oxide, magnesium oxide, zirconium oxide, and metal stearates including zinc stearate, calc
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