Seals and Gaskets for Demanding Applications

A Proven Performer Spreads its Wings

DuPont™ Kalrez® perfluoroelastomer parts are engineered to stand up against jet fuel, engine lubrication oils, hydraulic fluids, rocket propellants and oxidizers, all in the presence of extreme temperatures. The exceptional performance of Kalrez® parts are proven in applications, including mechanical seals in the chemical process industry, aviation, marine and gas turbines, auxiliary power units, hydraulic actuators and bleed air valves and fittings. Kalrez® perfluoroelastomer parts are manufactured and are sold by DuPont and its authorized distributors.

Kalrez® AeroSeal™ 7777 and 7797, developed for outstanding thermal stability at 325°C (617°F) and excellent compression set resistance, have been selected for use in jet engines. Both have superior High Thermo-oxidative Stability (HTS).

The latest product Kalrez® 7800 resists corrosion with titanium, and is manufactured in accordance with AMS7257D.

Bonding with Cost-Effective Performance

DuPont™ Vamac® ethylene acrylic elastomer provides resistance to mineral-based oils and synthetic engine oils at operating temperatures ranging from -40ºC (-40ºF) to 150º+ C (302ºF). Vamac® also provides excellent performance in the newest and most aggressive automatic transmission fluids (ATF).

Examples of Vamac® applications include:

  • Transmission lip seals – hot, cold, pressure, good process ability for seal dimensions and fit
  • Cam cover gaskets – low melt viscosity for molding and overmolding long sections; excellent swell resistance to keep thickness of gasket stable, eliminating leakage and oil weep.
  • Bonded Piston Seals — high-temperature durability and resistance to automotive service lubricants.

*The Viton® fluoroelastomer business is now part of The Chemours Company.  Visit for more information.


*For information on Neoprene, contact