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OK, ... fluoroelastomers, but which one? <br />Kalre' and Teflon are much more stable than <br />the stable grades of VI I -N, <br />but they are also much more expensive <br />... so consult polymer manufacturers for the <br />most cost effective choice of polymer and <br />grade for the fuel stored! <br />Kalrez® and Viton® are trademarks of DuPont Performance Elastomers L.L.C.; <br />Teflon® is a trademark of DuPont <br />C U PA <br />