Encapsulated O-Rings Product Know-How

Encapsulated O-Rings

Encapsulated o-rings are specifically designed to address the problem of sealing the most hostile chemicals and extreme temperature applications. Encapsulated o-rings consist of a solid or hollow elastomeric core encapsulated in a PTFE FEP or PFA sheath. To ensure an optimum chemical resistance ERIKS offers a unique compound with an extremely low compression-set. The elastomeric core may be fluorocarbon or silicon rubber. Solid core encapsulated o-rings are generally used in static applications. Hollow Silicone core encapsulated o-rings are commonly used in applications where lower sealing force is required as in semi dynamic applications. The encapsulated o-ring offers an effective solution for many difficult applications. The PTFE FEP or PFA encapsulation actually affects the seal and the elastomeric core insures consistent compression on the seal. The result is an overall sealing compression, increasing with medium pressure. The encapsulated o-ring behaves like a highly viscous fluid, any pressure exerted on the seal is transmitted in all directions. Maximum operating temperature for FEP is 205°C (400°F) and for PFA 260°C (500°F).

Encapsulated O-ring dimensions comply with International O-ring dimensional standards. The encapsulation does not increase the cross section compared to a standard elastomer of the same size.