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    { "id" : "http://dbpedia.org/resource/Butyl_rubber"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Butyl rubber is a synthetic rubber, a copolymer of isobutylene with isoprene. The abbreviation IIR stands for Isobutylene Isoprene Rubber. Polyisobutylene, also known as \"PIB\" or polyisobutene, (C4H8)n, is the homopolymer of isobutylene, or 2-methyl-1-propene, on which butyl rubber is based. Butyl rubber is produced by polymerization of about 98% of isobutylene with about 2% of isoprene." ] ,
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