Materials Overview

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• Materials Preparation Specification  Specification For Welded Steel Tanks, Stacks, Ducts or Other Fabricated Equipment For Protective Linings and Coatings

 

• PFA (perfluoroalkoxy) The most chemically inert of all the fluorinated materials. PFA is very similar in composition to PTFE and FEP (fluorinated ethylene-propylene). PFA and FEP both share PTFE’s useful properties of low coefficient of friction and non-reactivity but are more easily formable.

 

• FEP (Fluorinated ethylene propylene) ­ A fully fluorinated thermoplastic which is chemically inert. FEP is subject to attack at ambient temperature by alkali metals, alkali metal organics and fluorine.

 

• PTFE-M (Polytetrafluoroethylene) Is similar to PTFE in that both are chemically resistant to virtually all chemicals except alkali metals and fluorine at elevated temperatures. The primary difference is that PTFE-M is melt flow processable.

 

• ETFE (Ethylene Tetrafluoroethylene) -­ is a partially fluorinated thermoplastic. It is resistant to most chemicals except concentrated oxidizing acids at elevated temperatures, alkali amines, certain organic solvents, alkali metals at ambient temperature, fluorine at elevated temperatures, and certain halogenated compounds.

 

• ECTFE (Ethylene Chlorotrifluoroethylene) ECTFE is similar to PVDF in its chemical resistance and has somewhat improved resistance to caustic and chloride environments. It exhibits excellent melt processing properties and has the lowest coefficient of expansion of any of the fluorinated materials, making it a good selection for high thermal cycling environments.

 

• PDVF (Polyvinylidene Fluoride) ­ The most commonly used fluoropolymer. It has a high level of purity, excellent chemical resistance and a temperature capability of up to about 250 degrees F. It is frequently used for strong acids, solvents and in the handling of DI water. It is not recommended for caustics.

 

• Polypropylene (Polypropylene)­ This crystalline polymer has a temperature capability of about 212 degrees F. It is excellent in handling organic acids and alkalis, alcohols, aldehydes and phenols. It is unsuitable for halogens, aromatic and chlorinated hydrocarbons.

 

• PVC (Polyvinyl Chloride) ­ This amorphous thermoplastic is the most common. It is low in cost and is easy to fabricate. PVC is excellent in handling many strong acid and alkali solutions and has a temperature capability of about 140 degrees F.

 

• Rubber Soft & Hard Rubber Soft natural rubber has good resistance to most inorganic chemicals, alkalis, and low concentration acids. Hard natural rubber generally has better chemical and heat resistance than soft natural rubber.

 

• Hypalon Hypalon® (Chlorosulfonated Polyethylene) is a synthetic based elastomer with excellent resistance to ozone and sunlight, chromic, sulfuric and nitric acids.

 

• Chlorobutyl Chlorobutyl is a synthetic based elastomer with resistance to ozone and sunlight, strong alkalis and other harsh chemicals.

 

• Neoprene Neoprene (Polychloroprene) is a synthetic based elastomer and has excellent resistance to alkalis, sulfuric acid, and water. It is not suitable for solvents, halogens or phenols.