DESCRIPTION
Tecnoflon FKM fluoroelastomers consist of copolymers and terpolymers with a fluorine content of 66% and 68-70% respectively. They are available as base polymers (gumstock) or products formulated with ionic or peroxide curable systems.

Ionic Curable FKM
Ionic curable FKM materials have a good balance of mechanical properties and sealing performance along with ease of processing. They are available as base polymers (gumstock) or grades formulated with incorporated cure systems (denoted by the FOR prefix in the grade name). A variety of possible combinations of viscosity, cure rate, and cross-link density make them suitable for any molding process. The HS copolymers are designed for low post-cure cycles. Rubber-to-metal bonding grades are available for all molding techniques.

Ionic curable Tecnoflon® FKM products are categorized according to their monomer composition
* Copolymers are versatile polymers based on VDF and HFP monomers and have a fluorine content of 66%.
* Terpolymers offer better chemical resistance than copolymers due to their higher fluorine content (68-70%).
* Low-temperature terpolymers provide chemical resistance similar to ionic curable copolymers. Polymers have a fluorine content of 65.5% and they exhibit a lower glass transition temperature (Tg).

FKM Tecnoflon PFR 91 is a very high fluorine content, chemically resistant peroxide curable fluoroelastomer. It can withstand very aggressive conditions, such as almost all chemical species, including organic and inorganic acids, diluted alkalis, ketones, esters, alcohols, fuels and hot water.

Tecnoflon® PFR 91 bridges the gap between tradition fluorocarbons and perfluoroelastomers. It offers much improved resistance to polar solvents (aldehydes, ketones, esters, ethers, lactones, etc..) and bases (like aqueous ammonia) than high fluorine content peroxide curable FKMs (like Tecnoflon® P959). On the other hand, it shows enhanced cold flexibility when compared to FFKMs as indicated by the TR10 value.

Tecnoflon® PFR 91 represents the most cost effective sealing solutions for solvent mixtures, as the ones to be found in the chemical and process, paint and lacquers industries as well as in biopharma laboratories and pharmaceutical ingredient (API) manufacturing plants, for temperatures ranging from -20°C to 230°C.
Tecnoflon® PFR 91 can be combined with the cure system and other typical fluoroelastomer compounding ingredients; its mixing can be accomplished with two roll mills or internal mixers. Finished goods may be produced by a variety of rubber processing methods.

The primary use for Tecnoflon® PFR 91 is the manufacturing of any kind of elastomeric sealing element such as Orings, gaskets, valve bodies, butterfly valves, pump housings and stators, metal bonded parts, diaphragms, profiles, etc. These sealing elements can be used in mechanical seals, pumps, compressors, valves, reactors, mixers, sprayers, dispensers, quick connect couplings, controls, instrumentation, etc. in chemical and petrochemical industry, hydrocarbon processing, petroleum exploration and extraction, food processing, pharmaceutical and bio-analytical industry, aerospace and semiconductor manufacturing industries.

Tecnoflon® PFR 91 is registered in the FDA Inventory of Effective Premarket Notifications for Food Contact Substances. It can be compounded so that the finished gaskets or seals can be used in food processing equipments.

Tecnoflon® PFR 91 is marketed in the form of raw polymer (1 kg box) in order to give the transformer the freedom and the opportunity to develop and fine tune compounds and items best suited to the final application.