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fluoropolymerS are among the most stable <br />elastomer materials available for storing fuels <br />In descending order of stability and price: <br />11 Fluoroelastomers (FKM) "VITON @" <br />Polytetrafluoroethylene (PTFE) " reflon @" <br />Perfluoroelastomers (FFKM) "ALREZ @" <br />Kalrez® and Viton@ are trademarks of DuPont Performance Elastomers L.L.C.; <br />Teflon@ is a trademark of DuPont <br />C U P A <br />