KP4079 Datasheet
Kalrez, KP4079, FFKM, Black, 75A
DuPont™ Kalrez® 4079 (KP4079) is a 75 Shore A black perfluoroelastomer (FFKM) designed as a true general-purpose sealing material for chemically aggressive, high-temperature environments. Carbon black filled for improved mechanical strength, it offers excellent resistance to a wide range of organic and inorganic chemicals, including acids, alkalis, oils, solvents, alcohols, esters, ketones, and ethers, while maintaining low and stable compression set at elevated temperatures. Kalrez® 4079 has a maximum continuous service temperature of 315°C (599°F), with short excursions to higher temperatures possible, and demonstrates outstanding hot air aging and resistance to thermal cycling. Its relatively low modulus also aids installation and assembly compared to higher-stiffness FFKM grades.
Kalrez® 4079 is widely used for O-rings, gaskets, diaphragms, seals, and custom molded parts across chemical processing, semiconductor support systems, aerospace, and general industrial applications, covering the majority of non-steam FFKM use cases. It is not recommended for hot water or steam service, high-temperature aliphatic amines, or exposure to ethylene oxide or propylene oxide. For applications requiring steam or amine resistance, other FFKM grades are typically selected. Canyon Components offers equivalent general-purpose FFKM materials engineered to match the chemical resistance, thermal stability, and mechanical performance profile of Kalrez® 4079.
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