Chemical Compatibility of Partially Fluorinated Fluoropolymers

Partially fluorinated fluoropolymers with commercial significance include ethylene-tetrafluoro-ethylene copolymer (ETFE), ethylene-chlorotrifluo-roethylene copolymer (ECTFE), pol wnylidene fluoride (PVDF), and polyvinyl fluoride (PVF). The presence of hydrogen in these plastics lowers the fluorine content compared to perfluoropol5miers, and renders them susceptible to some chemicals. This means that care must be taken in the selection of these polymers to insure compatibility of process fluids. [Pg.17]

ETFE has excellent resistance to a great many chemicals. It is somewhat affected by oxidizers, chlorinated solvents, ketones, and esters but resists acids, alkalis, and organic solvents. Tests should be conducted in each specific application to verily the validity of the values (data) provided. [Pg.17]

Hydrolytic stability of ETFE is indicated by retention of its physical properties after extensive exposure to boiling water. Tensile strength and elongation changed little after 3,000 hours exposure of unfilled ETFE to boiling water. [Pg.17]

in general, resists inorganic acids, bases, salt solutions, oxidizing agents, and halogens. It is, however, attacked by concentrated sulfuric acid and medium concentration alkaline solutions. PVDF is imaflfected by alcohols, chlorinated solvents, aliphatic [Pg.17]

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