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Fluorinated ethylene propylene

Fluorinated ethylene propylene, Teflon-FEP, or FEP is a copolymer of hexafluoropropylene and tetrafluoroethylene. It differs from the PTFE (polytetrafluoroethylene) resins in that it is melt-processible using conventional injection molding and screw extrusion techniques. Fluorinated ethylene propylene was invented by DuPont and is sold under the brandname "Teflon-FEP". Similar product is available from Daikin with the brand name of Neoflon-FEP.

FEP is very similar in composition to the fluoropolymers PTFE (polytetrafluoroethylene) and PFA (perfluoroalkoxy polymer resin). FEP and PFA both share PTFE's useful properties of low friction and non-reactivity, but are more easily formable. FEP is softer than PTFE and melts at 260 °C; it is highly transparent and resistant to sunlight. [cite web | url = http://www2.dupont.com/Teflon_Industrial/en_US/products/product_by_name/teflon_fep/index.html | title = Teflon FEP | publisher = DuPont | accessdate = 2007-10-17] [cite web | url = http://www.texloc.com/closet/cl_fep_properties.htm | title = FEP Detailed Properties | publisher = Parker-TexLoc | date = 2006-04-13 | accessdate = 2006-09-10]

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