| http://www.w3.org/ns/prov#value | - Polybutadiene elastomer may be conveniently characterized, for example, by having at least a 90 weight percent cis-1,4-content. [0062] Representative examples of suitable filler materials include metal oxides, such as silica (pyrogenic and precipitated), titanium dioxide, aluminosilicate and alumina, siliceous materials including clays and talc, and carbon black.
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