| http://www.w3.org/ns/prov#value | - Particularly where the materials are used as closure or sealing means such as stoppers, septa, screw caps, cap inserts orsyringe plungers it may be advantageous to employ elastomeric polymers, examples of which include but are not limited to polyethylene, polypropylene, polyisobutylene, polystyrene, polyvinylchloride, polyacrylonitrile, perfluorinated polymers such asTeflon.RTM., natural rubber, b
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