Recognized as the leading supplier of perfluoroelastomer parts for over 40 years, DuPont offers a variety of high performing products that are formulated to give the best possible seal performance in numerous aggressive environments. Excellent balance of finished properties is achieved through careful use of proprietary polymers, cure systems, fillers and additives, resulting in superior seals for a broad range of applications.
Kalrez® 4079
Kalrez® 4079 is among the most popular of all Kalrez compounds. Released in the 1980's, this compound has been a mainstay and go-to for many Gallagher customers. 
Kalrez® 4079 parts are a low compression set product for general purpose use in O-rings, diaphragms, seals and other parts used in the chemical process and aircraft industries.
It is a carbon black filled product with excellent chemical resistance, good mechanical properties, and outstanding hot air aging properties. It exhibits low swell in organic acids, inorganic acids and aldehydes, and has good response to temperature cycling effects.
A maximum service temperature of 316°C (600°F) is suggested, with short excursions to higher temperatures possible. Kalrez® 4079 is not recommended for use in hot water/steam applications or in contact with certain hot aliphatic amines, ethylene oxide, or propylene oxide.
The chemical resistance excellence of the Kalrez 4079 is a characteristic shared with the majority of Kalrez perfluoroelastomer parts. Seen as the industry standard in this characteristic, these products can withstand contact with over 1,800 different chemicals, solvents and plasmas, while maintaining their elasticity and recovery properties.
For difficult sealing applications, Kalrez 4079 could be the right fit for you.
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Gallagher Fluid Seals is an authorized distributor of Dupont and Kalrez products.