PVDF-EL – antistatic polyvinylidene fluoride – is intended for specific applications, such as conveyance of flammable or highly corrosive liquids or gases (chlorine gas) or for installation of pipelines in explosion-proof areas. Since this material is an excellent electrical conductor, it can be connected to earth networks to dissipate the charges that form inside or outside the pipeline. PVDF EL is therefore covered by ATEX directive 94/9 EC, on the condition that an efficient earth connection is guaranteed for the entire pipeline. The main application is for the extraction of solvent vapors in the pharmaceutical industry or in chlorine electrolysis processes. These are just some application examples of PVDF EL – antistatic – in which the material has displayed exceptional mechanical and chemical resistance.
Antistatic and self-extinguishing PVDF EL is based on suspension polymerization, while the two other products, Kynar and flexible PVDF Kynar, are made by emulsion polymerization.
Advantages of antistatic and self-extinguishing PVDF EL - black color
All materials described above are suitable for application with products like halogenated solvents, alcohols, aliphatic and aromatic hydrocarbons, basic liquids with pH<12, organic acids, etc. On the contrary, their use with basic liquids with pH>12, 98% sulfuric acid, strongly polar solvents, alkaline metals in their liquid state, etc. is not advisable without our advice.
Welding process
Materials can be welded with standard welding techniques used for thermoplastic materials. However, since these materials (sheets and pipes) are mostly thin and/or have binding layers like mats or mesh which are made in several materials, like glass, whether synthetic or polyester, hot air welding with filler material is suggested. Of course, butt welding is also possible using suitable welding machines
Sizes and conditions of use
These pipes, which are destined to be lined with fiberglass, are not subject to the definitions of internal and external pressure values, since these elements depend on the thickness of the fiberglass lining. Therefore, the existing mechanical strength of the liner pipe must be not considered in the static calculation, and the lining layer only must be considered as the statically supporting element. This is the reason why we have indicated neither positive nor negative pressure values for these pipes. They are defined as “Liner” pipes in this document.
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