The Global O-Ring Encapsulated Viton and Silicone O-Ring
This o-ring is comprised of a jacket of Teflon®* encapsulating a solid core of Viton® (TEV) or Silicone (TES). Encapsulated o-rings outperform traditional elastomeric o-rings in hostile environments through their excellent chemical resistance and mechanical properties over a wide temperature range. They surpass the performance of solid Teflon® o-rings because they have both memory and recovery.
Our standard encapsulated o-rings are the most resilient. Depending on the core material, they are suitable for operating temperatures from -62° to 204°C (-80° to +400° F). Encapsulated o-rings resist almost all chemicals and retain their mechanical properties even during long hostile exposure. They also have excellent dielectric properties, a low coefficient of friction, flexibility, weather resistance, toughness, and negligible moisture absorption.
Solid or Hollow-Core Design:
Standard encapsulated o-rings are supplied with either solid Viton® or Silicone energizers. Solid core energizers provide the best resistance to compression set and the best “recovery”. Hollow-Core o-rings provide effective sealing where a more flexible and easier to squeeze o-ring is required. Hollow-Core o-rings reduce the amount of force required to provide an effective seal. This type of seal is especially useful in fragile applications and is available in both Viton® and silicone cores. Global O-Ring standard product is solid core but hollow-core is available by request.
The outer jacket of encapsulated o-rings can be made from one of two materials: FEP or PFA. FEP is used in Global O-Rings standard offering.
FEP (fluorinated ethylene propylene) – FEP jacketed o-rings offer excellent resistance to a broad range of corrosive chemicals, including alcohols, aromatic solvents, naphtha, acids, and petroleum spirits. They also have a low compression set and coefficient of friction. The operating temperature range of encapsulated o-rings with FEP jackets is -60°C to +205°C (-76°F to +400°F). The o-rings are FDA, USP CLASS VI, and SANITARY 3A compliant.
PFA (perfluoroalkoxy-copolymer) – PFA possesses many of the same properties as FEP. However, it does exhibit higher mechanical strength and better resistance to stress and cracking. Encapsulated o-rings with PFA jackets are typically used in applications where extreme thermal stability and durability are required. They are suitable for use in operating temperatures ranging from -60°C to +260°C. (-76°F to 500°F) and typically have a longer service life.
Cure System, Bisphenol-Cured
Standard Low Temp: -60°C (-76°F)
Standard High Temp: 220°C (428°F)
The Right Encapsulated O-Ring is Application-Specific
Choosing the properly encapsulated o-ring will largely depend on the specific needs of the application. Global O-Ring and Seal carries a full line of encapsulated o-rings in all AS568 standard sizes. Custom sizes are available upon request — as are o-rings with rectangular, oval, and square cross-sectional profiles.
If you are in need of a custom solution contact us today to speak with one of our technical sales professionals.
* Teflon® and Viton® are Registered Trademarks of DuPont Company.