Kalrez® O-Rings and Seals

Critical Properties

* Copyright for photograph

Kalrez® perfluoroelastomer o-rings and seals last longer and seal more effectively than other elastomers due to their exceptional chemical resistance and thermal stability. Longer-lasting seals can be a direct route to extended mean time between replacement and lower cost of ownership.

Thermal Stability

Even after long-term exposure to temperatures up to 327°, Kalrez® retains its elasticity and recovery properties better than other high temperature elastomers.

It resists hardening and embrittlement, the principal heat-related cause of seal degradation and failure. And in high-vacuum applications, Kalrez® exhibits negligible outgassing over a wide range of temperatures. This helps reduce pump-down times and is a key requirement in semiconductor manufacture and other applications where a contamination-free environment is critical.

Exceptional Chemical Resistance

Kalrez® parts have virtually universal chemical resistance. They withstand attack by more than 1,800 chemicals including solvents, amines and plasmas. Kalrez® seals last longer than other elastomers on the market.

Maintains sealing force to keep seals tight

As proven in ISO 334 tests, Kalrez® outperforms other elastomers when it comes to sealing force retention, a measure of seal life. Even under harsh and aggressive conditions, Kalrez® will retain its sealing force longer in both short and long-term serivces. And thanks to its true-rubber resiliency, Kalrez® prevents leaks caused by creep, a major problem with PTFE and other plastic materials.

Low Compression Set

Long-Term O-Ring Compression Set at 204ºC (400ºF)

As shown above, Kalrez® parts exhibit low compression set, maintaining their elastic recovery to maintain tight seals over the long haul. Because Kalrez® parts recover better under compression than other perfluoroelastomers, they maintain their shape better under prolonged stress.

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Kalrez® is a registered trademark of DuPont Performance Elastomers

* © Photographer: NASA