FEP/PFA Encapsulated Silicone & Viton™ 'O'-Rings | Vulcan Seals
FEP/PFA Encapsulated 'O'-Rings and Seals
FEP/PFA Encapsulated 'O'-Rings

FEP/PFA Encapsulated Seals

Vulcan Seals is a leading manufacturer of FEP/PFA Encapsulated 'O'-Rings and Seals globally.

We have the capacity to produce virtually any cross-section and diameter size or shape of seals, backed by a Stock Guarantee on the most common items and a short lead time on the rest. Carefully monitored production and multiple levels of electronic inspection ensure high product quality and reliability.

FEP/PFA Encapsulated 'O'-Rings

An Encapsulated 'O'-Ring is an 'O'-Ring bound by a seamless and uniform FEP/PFA encapsulation, which encloses an elastomeric core, completely protecting it from the media. They combine the energising properties of an elastomeric 'O'-Ring with the resilience to extreme temperatures and hostile chemicals of FEP/PFA.


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Benefits of Encapsulated Seals

  • Exceptional resistance to aggressive chemicals and gas permeability
  • Cost efficient alternative to Kalrez® and similar perfluoroelastomer 'O'-Rings
  • Low coefficient of friction allowing reduced wear of equipment
  • Adaptive sealing force of an elastomeric 'O'-Ring
  • Resistant to compression set/cold flow issues of solid 'O'-Rings


Encapsulation Options 

  • FEP Encapsulation
    Standard material for all applications up to 205°C, resistant to virtually all chemicals and joined by an advanced heat moulding process to give a seamless encapsulation.
  • PFA Encapsulation
    Same properties as FEP encapsulation but with greater heat resistance for applications above 205°C. Also resistant to virtually all chemicals and joined seamlessly via advanced heat moulding process.


Inner Core / Profile Options

Cross Section Options

  • Silicone Inner Core
    Commercially best material option combined with lower Shore Hardness and greater elasticity than Viton™ rubber, providing an excellent material choice for the majority of applications.
  • Viton™  Inner Core
    Greater chemical resistance than Silicone. If encapsulation is damaged, Viton™ rubber provides greater resilience to chemical attack.
  • Silicone Hollow Inner Core
    Greater compressibility than solid Silicone core, with a hardness similar to a standard elastomeric 'O'-Ring. The hollow core flexibility means less clamping force is required to enable its sealing abilities. Ideal for fragile applications using sensitive materials, such as glass or light plastics. Useful for where the sealing area may require room for movement during operation.
  • Silicone/Viton™ Square/Rectangular Core
    Designed to be a gasket seal, as opposed to an 'O'-Ring. In particular, the rectangular cross-section is designed to be a universal fit, non-contaminating Kamlock™ hose coupling seal. It eliminates the need to specify different elastomers for different applications and stops coupling leakage due to chemical attack or creep of a solid PTFE gasket seal.
  • Custom Core Profile
    We also manufacture special custom profile and ring shapes to your application needs.


Ring Shape Options

  • Non-standard ring shapes
    Non-standard ring shapes (e.g. square, rectangular, oval) are possible on request to suit specific application requirements.


Stock Guarantee with Same Day Global Despatch

With advanced production facilities in Europe and Asia, we are able to Stock Guarantee over 20,000 sizes - covering all AS/BS sizes and all common metric sizes, plus many non-guaranteed sizes are stocked to previous demands. Same Day Global Despatch is available for the vast majority of your requirements.

Short lead times are also available for non-guaranteed items - more details are available on our Web Portal.


Material Quality and Reliability

Vulcan Seals FEP/PFA Encapsulated Seals are manufactured in our high specification, ISO9001 certified factories to stringent quality requirements and standards. Only the highest possible grades of materials with the tightest tolerances are specified.

Utilising Eason® computer-controlled shadow graphs, Mitutoyo® CMM and Micro-Vu® digital imaging machines ensures the high quality and reliability of these seals.

Every batch of seal produced is fully processed through our extensive electronic inspection systems prior to despatch. Copies of our SKIS inspection forms and procedures are available on request.


Enquire Today

We can meet any of your Encapsulated Seals requirements - contact us today.

Where required, we can provide documentation on our inspection process, materials, sizes, tolerances, EC/FDA food industry regulation compliance and more.

Contact Us

World: +44 (0) 114 249 3333

Americas: +1 952 955 8800



Send us an enquiry

To help us provide you with the best answer, please provide as much of the following as possible:

  • Encapsulation material
  • Core material
  • Inner diameter
  • Cross section size
  • Quantity

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