| http://www.w3.org/ns/prov#value | - In the case of rubber, polybutadienes, butadiene copolymer rubbers, or their maleicmodified products may be used; in the case of plasticizers, commercial products from adipic or phthalic acid and glycols, and epoxidized soybeen oil may be used; and in the case of fillers, certain types of commercial calcium carbonate, silica and titanium dioxide may be useful, respectively.
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