FEP-encapsulated O-rings
Elasticity with the highest media stability - encapsulated FEP O-rings offer excellent operational safety in superior static seals.
The combination of an elastomer O-ring and a closed sheath made of modified PTFE (FEP) makes our FEP O-rings the ideal sealing component against aggressive media while maintaining highly elastic properties for optimal contact pressure as only an elastomer can provide.
Depending on the required temperature stability, FKM or VMQ is used as the core material. The encapsulation is made of FEP or PFA. Due to the encapsulation, the range of applications focuses exclusively on static seals.
Our program is available in almost all required dimensions, internal diameters and cross sections in inch and metric and with both the encapsulation and on request the elastomer core being FDA compliant.
A summary of the advantages:
- Highly stable in almost all chemicals
- Universally applicable
- Dimensions that are independent of tools, in many cases in stock
Function
- Elastomer core ensures elastic contact pressure
- FEP or PFA encapsulation provides effective protection against aggressive media
Dimensions
- Basically all metric and inch cross sections, in standard dimensions in stock
- FEP/PFA O-rings can be supplied without additional tooling costs in any size internal diameter; the smallest possible internal diameter is however limited by the thickness of the cord
- Pure PTFE O-rings can be supplied in any size, as they are made by machining.
| FKM core/FEP encapsulation | with extremely good DVR* and permissible temperatures from –26 °C to +205 °C |
| VMQ core/FEP encapsulation | for low temperatures from –60 °C to +205 °C |
| FKM core/PFA encapsulation | for high wear resistance and use in temperatures from –26 °C to +205 °C |
| VMQ core/PFA encapsulation | for high wear resistance and extreme temperature ranges from –60 °C to +260 °C |
| Where low contact pressure is required in sensitive apparatus, the use of a VMQ hollow core is possible | |
| For profiles with oval, square or semicircular cross sections (edges always rounded), please contact Freudenberg Process Seals | |
*DVR = compression set
Application areas
FEP/PFA encapsulated O-rings are predominantly used in demanding applications:
- With aggressive media with requirements of universal chemical stability
- With high thermal loading in low and high temperature ranges
- For applications in machinery in the food and beverage and pharmaceutical industry where different media are used and where aggressive cleaning chemicals are used
- With small quantity as a cost-effective alternative, as manufacture does not require any tools
Do you have any questions?
Downloads
- FEP-Encapsulated O-Rings (pdf | 0,24 MB)
- FEP Brochure (pdf | 0,4 MB)