The sheet is dusted with talc to ensure smooth easy unwind from the roll. Polyisobutylene also known as pib or polyisobutene c 4 h 8 n is the homopolymer of isobutylene or 2 methyl 1 propene on which butyl rubber is based. Developed over 30 years ago plysolene pib has outstanding properties over a wide temperature range 30c to 100c hence it is used globally in oil refineries chemical works and power stations.
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