Chem-Ring® FEP/PFA Encapsulated O-Rings from Vulcan Seals.
FEP/PFA Encapsulated O-Rings offer far superior performance to solid PTFE O-Rings as these routinely suffer from ‘Compression Set & ‘Coldflow’.
Near universal capabilities at a fraction of the cost of expensive Perfluoroelastomer alternatives and a one material replacement to the various common elastomeric O-Rings. (which will fail or suffer performance degradation in severe environments).
Manufacturing standards and quality
The Encapsulated O-Ring consists of a seamless and uniform Teflon® encapsulation, which completely encloses the core material of Silicone or Viton®. The nature of the moulding process is critical to the quality of the Ring. Standards for the manufacture of moulded rubber O-Rings call for close tolerances on the I.D.’s and particularly, the cross sections of the rings. Outside these tolerances any step in the cross section can severely affect the O-Rings ability to seal.
Materials
Encapsulated O-Rings are available with FEP or PFA Teflon® polymer encapsulation. The capabilities of these two polymers are essentially similar, except that PFA exhibits better heat resistance once above 200°C. FEP Encapsulation is the preferred standard for all applications below 205°C, continuous temperature. Core materials are either DuPont Viton® or High Temperature Silicone.
FDA Compliant
The FDA/PFA Encapsulation of the TEFLON® Encapsulated O-Ring complies with Part 177 of title 21 of the F.D.A. Regulations, for safe use as articles (or components of articles) for producing, manufacturing, processing, preparation, treating, packing, transport or holding food in accordance with F.D.A. Regulation 21 CFR 177.1550.
Minimum I.D. Sizes
Virtually any size of I.D. or cross section of Encapsulated O-Rings can be made using existing stocks of material. The only possible normal limitation is the minimum size of I.D. that can be physically encapsulated without kinking. This varies with the cross section of the ring and developments in manufacturing methods.
With over 4,000,000 lines in stock we can satisfy many orders instantly.
For information or non stock lead times please contact our sales team on 01226 273700 or ask@ashton-group.co.uk
Viton® is a registered trademark of DuPont Dow Elastomers.
If you require genuine DuPont Viton please specify this to our sales team.
Teflon® is a registered trademark of DuPont Dow Elastomers.
Kalrez® is a registered trademark of DuPont Dow Elastomers.