FFKM

Perfluoroelastomers (FFKMs), while offering outstanding chemical and thermal resistance, have several limitations that restrict their broader use. They are among the most expensive elastomers due to complex synthesis, high fluorine content, and intensive processing requirements, making them suitable primarily for critical applications. FFKMs generally have poor flexibility at low temperatures, with glass transition temperatures typically around -20°C. Finally, although chemically resistant to a wide range of substances, FFKMs can still degrade in the presence of specific aggressive media, necessitating careful material selection for each application. == Curing Systems in FFKM Compounds ==

Curing is a critical step in manufacturing FFKM elastomer parts, transforming the base polymer into a final product with usable mechanical properties. The curing system determines not only the material’s chemical and thermal stability but also its processing characteristics and suitability for specific applications. FFKM materials are generally cured using one of three main systems: 1. Peroxide Curing Peroxide curing is the most common method for FFKM formulations. It uses organic peroxides to initiate a free-radical reaction, leading to the formation of crosslinks between polymer chains. 2. Triazine Curing Triazine curing involves the formation of crosslinks through the reaction of triazine compounds with perfluorinated vinyl groups in the polymer. This method is known for producing very pure, clean, and thermally stable elastomers. 3. Other special curing methods Besides triazine and peroxide curing systems, several leading FFKM manufacturers have developed proprietary cross-linking technologies that remain undisclosed to the public. ==References==