Kalrez Perfluoroelastomer

Kalrez perfluoroelastomer Kalrez is a registered trademark of DuPont... 

DuPont Dow Elastomers fuel-resistant Viton f fluoroelastomers are an important source for the applications described previously. The company s Kalrez perfluoroelastomers with reduced contamination are widely used with semiconductors and other contamination-sensi-... 

Kalidar, PEN container, fiber resins, DuPont Polyester Resins Intermediates Kalrez, Perfluoroelastomer parts, DuPont Kane Ace, Impact modifiers/processing aids, Kaneka Texas... 

This comprehensive article highlights to problems that occur due to failure of pump seals and valve seats and the consequent costs to the plant operators. The article highlights particularly Kalrez perfluoroelastomer from Du Pont, which combines chemical resistance and resilience and so extends the use of elastomers into areas where mbbers had previously failed. The article supplies full details of the material and its properties. 

The combinations of these perfluorovinyl ethers with tetrafluoroethylene have prompted the commercialization of various fluoropolymers of industrial importance, such as Kalrez perfluoroelastomer, Teflon PFA thermoprocessable perfluororesin without deteriorating the excellent properties of PTFE. Nafion and Flemion are sulfonated and carboxylated perfluorinated ion exchange membranes, respectively. 

Another category of fluoroelastomers, called FEPM has been created recently for base resistant fluoroelastomers. For higher temperature and chemical resistance fiiUy fluorinated materials, called perfluoroelastomers, are available in the form of molded seals and parts, such as Kalrez perfluoroelastomers parts and Chemraz Perfluoroelastomer Compounds. They bear the classification of JK or HK depending on supplier and compound offered, JK offering a continuous service temperature of 315°C. FFKM compounds are available from most FKM suppliers but gums are rarely available and in this chapter we focus on fluoroelastomers FKM and FEPM. 

Perfluoroelastomers represent a special subgroup of fluorocarbon elastomers. They are essentially rubbery derivatives of PTFE and exhibit exceptional properties, such as unequaled chemical inertness and thermal stability. Currently, there are two types of known commercial perfluoroelastomers, KALREZ and PERLAST . These have ASTM designation FFKM. 

Perfluoroelastomers (FFKM), such as KALREZ, are particularly suited for extreme service conditions. They are resistant to more than 1,500 chemical substances, including ethers, ketones, esters, aromatic and chlorinated solvents, oxidizers, oils, fuels, acids, and alkali and are capable of service at temperatures up to 316°C (600°F).55 Because of the retention of resilience, low compression set, and good creep resistance, they perform extremely well as static or dynamic seals under conditions where other materials, such as metals, FKM, PIPE and other elastomers, fail. Parts from FFKM have very low outgassing characteristics and can be made from formulations, which comply with FDA regulations.56 Primary areas of application of perfluoroelastomers are paint and coating operations, oil and gas recovery,... 

Perfluoroelastomers, such as Kalrez (copolymer of TEE and PMVE), can maintain their thermal stability to temperatures as high as 300°C (572°F) or even higher, with a maximum continuous service temperature of 315°C (599°F). Moreover, instead of hardening, the elastomer becomes more elastic with aging.13... 

Kalrez . [DuPont] Perfluoroelastomer finished rubber prods. 

One such perfluoroelastomer is sold by DuPont under the trade name Kalrez. As with other perfluoroelastomers, Kalrez is available in different compounds to meet specific needs. 

Perfluoroelastomer (tetrafluoro-perfluoro-methyl vinyl ether co-polymer) n. Introduced by DuPont in 1977 as Kalrez , this elastomer combines the properties of a conventional fluoroelastomer, such as vinyhdene fluoride-hexafluoropropylene co-polymer, with those of a fluorocarbon resin such as polytetrafluoroethylene. It has found application for O-rings and seals that must withstand strong chemicals and solvents at high temperatures. 

TFE/P is also quoted as performing well in a high-pH completion fluid at 175°C, showing similar performance to Viton. Perfluoroelastomer (e.g. Kalrez ) seals give excellent performance in amines since the material is almost entirely chemically inert. Table 11 shows the effect of highly concentrated inhibitor and the minimal change which occurs. 

In 1970, DuPont introduced a perfluoroelastomer under the trade name of Kalrez that is based on tetrafluoroethylene and perfluoromethylvinylether [31]. 

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