DuPont Performance Polymers Kalrez® AeroSeal™ 7777 Fluoroelastomer

DuPont™ Kalrez AeroSeal™ 7777 perfluoroelastomer parts are a specialty black product that meets the requirements of Aerospace Material Specification (AMS) 7257C. It offers outstanding thermal stability and compression set resistance along with excellent seal force retention properties. It also offers excellent resistance to HTS (High Thermo-Oxidative Stability) gas turbine engine lubricating oils and has excellent response to temperature cycling effects. Kalrez AeroSeal™ 7777 has good mechanical properties and is well suited for both static and dynamic sealing applications. A maximum continuous service temperature of 325 C (617 F) is suggested. Short excursions to higher temperatures may also be possible. Performance Features/Benefits Outstanding thermal stability Outstanding compression set resistance Excellent seal force retention properties Excellent resistance to high thermo-oxidative stability (HTS) gas turbine engine lubricating oils Excellent response to temperature cycling effects Excellent mechanical properties Lower coefficient of thermal expansion (CTE) versus other Kalrez® products thus minimizing the need to increase the free volume of the seal gland when upgrading from fluoroelastomers (FKM) to perfluoroelastomers (FFKM) to Kalrez® AeroSeal™ 7777.