Encapsulated o-rings are double-action sealing elements. The seal is provided by the FEP or PFA encapsulation; whereas, the elastomer o-ring (FKM / Viton rubber, Silicone), serves as an elastic pretension element exerting a permanent and uniform pressure against the mating surface.
Encapsulated o-rings are used wherever conventional elastomer o-rings cannot be used due to their inadequate chemical resistance. Encapsulated o-rings are primary used as static seals (axial and radial) for lids and covers, flanges etc.
Material available
Viton (Fluorocarbon Rubber)
recommended for use in hot chemical corrosive environments that are very degrading to most other rubber compounds
use in Aerospace, Oil and Gas, Automative and Chemical manufacturing
temperature range: 0° F (-17°C) to +400°F (204°C), 75 Durometer
Silicone
possesses mechanical properties similar to Viton compounds but with slightly lower compression set resistance.
excellent heat resistance and the best low temperature flexibility of all elastomers
temperature range: -60° F (-51°C) to +400°F (204°C), 70 Durometer