ECTFE
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IUPAC name
poly(1-chloro-1,2,2-trifluorobutane-1,4-diyl)
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poly(ethene-co-chlorotrifluoroethene)
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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ECTFE (Ethylene ChloroTriFluoroEthylene) was designed to provide excellent chemical resistance in heavy duty corrosion applications. It is a partially fluorinated polymer (a fluoropolymer), semi-crystalline and can be processed in the melt. Chemically it is a copolymer of ethylene and chlorotrifluoroethylene. It is marketed under the brand name Halar ECTFE by Solvay Specialty Polymers, a subsidiary of Solvay.
Since its introduction in 1970, ECTFE has been used in many industries where excellent corrosion resistance is the key to success. It is resistant to acids even at high concentrations and temperatures, caustic media, oxidizing agents and many solvents. It is said to have similar chemical resistance to PTFE. A chemical resistance table based on immersion tests is available. Moreover, ECTFE has for many permeating species the best permeation resistance of all fluoropolymers. Permeation of large molecules is usually rather slow in fluoropolymers and thus not relevant in the final application. Small molecules, however, may permeate through the polymer matrix in a relevant time. In lining or coating applications, the permeation of certain small molecules determine the lifetime of anticorrosion protection. H2O, O2, Cl2, H2S, HCl, HF, HBr, N2, H2, CH3OH, etc. are relatively mobile in a polymer matrix and lead to measurable effects. In particular in lining and coating applications, the permeation resistance is the key to success as permeating species may attack the underlying mechanical layers, such as fiber reinforced plastic or steel. Various commercial data bases confirm the excellent permeation resistance of ECTFE. This high permeation resistance to small molecules is a consequence of the free volume occupied by the chlorine atom on the polymer chain.
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