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 PL 557 is a new generation low temperature peroxide curable fluoroelastomer with 65.5% wt fluorine content. Tecnoflon® PL 557 exhibits excellent low temperature flexibility (TR10 = -29°C), close to Tecnoflon® PL 455, but with improved chemical resistance and permeability. Like all other Tecnoflon® peroxide curable grades, it exhibits excellent processability; moreover it needs very short post-curing cycles.

Some of the basic properties of TECNOFLON® PL 557 are:

• Excellent low temperature flexibility

• Low post cure • Superior mold flow

• Lack of mold fouling

• Excellent mold release

Tecnoflon® PL 557 can be used for injection, injectioncompression and transfer molding of O-rings, gaskets and seals. This material can be extruded into hoses or profiles and can be calendered to make sheet stocks or belting. Tecnoflon® PL 557 can be combined with the cure system and other typical fluoroelastomer compounding ingredients. Mixing can be accomplished with two-roll mills or internal mixers.