prov:value
| - The materials from which the movable dividing member or piston is made are preferably elastomeric materials that are impermeable and include but are not limited to polypropylene, rubbers such as EPDM, silicone rubber, butyl rubber, and the like, fluoro elastomers, perfluoro elastomers, and thermoplastic elastomers such as plasticized polyvinylchloride, polyurethanes, Santoprene???, C-Flex??? TPE,
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