Polyvinylidene fluoride fluorocarbon material

The macromolecule of polyvinylidene fluoride (PVDF) consists of a linear chain in which the predominant monomer unit is [—CH —CF —] . PVDF has good weathering resistance and it is resistant to most chemicals and solvents but less inert than PTFE, PFA and FEP in the same conditions. PVDF is nonflammable and exhibits greater mechanical strength, wear and creep resistance than other fluorocarbons. PVDF is heat resistant up to 150°C. However, the material is much more workable and has been made into essentially any shape necessary for the chemical process industry. Complete pumps, valves, piping, smaller vessels, and other hardware have been made and have served successfully. The material may also be applied as a coating or as a liner. 

Additionally, any suitable fluorocarbon may be used as a toner release material. Preferred fluorocarbons include polyvinylidene fluoride such as that sold under the trademark Kynar and manufactured by the Penwalt Corporation. ... 

Wet chlorine is very corrosive to all of the more common construction metals. At low pressures wet chlorine can be handled in chemical stoneware, glass or porcelain equipment and in certain alloys. Hard rubber, polyvinyl chloride (maximum of 41 kPa (6 psig)), fiberglass-reinforced polyester, polyvinylidene chloride or fluoride and frilly halogenated fluorocarbon resins have been used successfully. For maximum working pressure see Chlorine Pamphlet 6 [9]. All of these materials must be selected with care. For higher pressures, lined metallic or compatible metallic systems should be used. In the metallic systems, Hastelloy C, titanium and tantalum have been used. Within limits, titanium may be used with wet chlorine, but must not be used with dry chlorine under any circumstances because it bums spontaneously on contact. Tantalum is inert to wet and dry chlorine at temperatures up to 300°F(149°C). 

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