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Kel-F [r]: PCTFE (PolyChloroTriFluoroEthylene) polymer consisting of chlorotrifluoroethylene and vinylidine fluoride in a 3:1 ratio; most common name and trademark of 3M but no longer manufactured by the company — others Neoflon and Aclon; used in valves with low friction and high chemical resistance, and plastic bonded explosive and insensitive high explosive such as LX-17 and PBX-9502