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CHEMGUARD FS-909-7 is an anionic perfluorotelomer at 45% actives; useful in forming an excellent polar solvent vapor barrier in AR-AFFF agents. CHEMGUARD FS-909-7 is soluble in tap and sea water and fully compatible with anionic, amphoteric, and nonionic surfactants. It provides excellent foam properties and drain times when used in the presence of polysaccharides, especially in sea water. It also helps improve hot edge sealing properties and burnback performance in AR-AFFF agents.