Encapsulated O Rings

Encapsulated O Rings that are proven to protect the core

M Barnwell Services, the UK’s leading manufacturer, stockist and distributor of Fluid Sealing Products offers a comprehensive range of quality Fluorinated ethylene propylene (Teflon® FEP), PTFE and Perfluoroether (PFA) Encapsulated O Rings as well as Ncap® Seals.

The design completely encloses a core material and acts as a barrier if any pressure is exerted on the seal. The Encapsulated O Rings is widely used across a range of industries, including Food and Drink (FDA), Chemical Processing, Petrochemical, Pharmaceutical, Paints and Dyes, Refrigeration and Cosmetics. For Cryogenic applications, we also supply the industry-leading Astra Seal.

Available in a wide range of standard Metric and Imperial sizes the Encapsulated O Rings can be supplied as small as 4.5mm ID and with no maximum size. M Barnwell Services Encapsulated O Rings are compliant with FDA, ADI-Free, 3A Sanitary Standards, EU Reg. 1935/2004 and USP Class VI.

We also supply a range of Viton (FKM) FDA and EC1935/2004 & EC2023/2006 Approved, Silicone (VMQ) and EPDM Core with FEP Jacket Encapsulated O Rings.

Seal Profile Options:

Temperature range chart:

Typical Markets & ®Applications

Filter Elements
– Filtration is the primary market for encapsulated seals.
– Versatile encapsulated seals are now a standard choice for filter cartridge element neck seals.
Pumps
– PTFE-made pumps utilise encapsulated seals for corrosive material handling.
– Plastic pumps, requiring low-load seals, benefit from hollow-core encapsulated seals.
Mechanical Seals
– While Perfluoroelastomers are common, encapsulated seals serve as a cost-effective alternative in various applications.
Valves
– Widely used in air-operated vent valves, steam valves, and water valves for FDA/WRC compliance.
Mixers and Vessels
– Encapsulated seals on lid seals eliminate the need for expensive moulds.
– USP Approval and FDA compliance make them ideal for the pharmaceutical & food & beverage market.
Heat Exchangers
– Tube and shell heat exchangers benefit from Teflon®-jacketed encapsulated seals.
– Popular in food, drink, and pharmaceutical industries due to USP Approval and FDA Compliance.
Flanges
– Encapsulated seals are vital for sealing flanges and apertures.
– For optimal chemical resistance with low compression force support, it is advisable to use hollow-core seals in chemical industry applications.

The M Barnwell Services’ experts can determine if an FEP / PFA encapsulated O Ring is suitable for your particular application. If you would like more information, download our catalogue or contact a member of the team.

We also have over 50 million O Rings and Back-Up Rings in stock. For more information on our range of O Rings click here.

E & OE.

Sizes

NCap® Seals can be custom engineered to fit a wide-range of dimensions. Standard options include: Circular/O Ring, D-shaped, rectangular and square-cross section.

O-Ring Sizes- 4.5mm ID minimum and with no maximum standard size.

Materials

Fluorinated ethylene propylene (Teflon® FEP), Perfluoroether (PFA), PTFE and Elastomer

Silicone and FKM are used as the material for the core of the encapsulated O Ring whilst EPDM is not recommended due to heat-related variations during the production process. FKM and silicone withstand these variations during manufacturing without a decrease in execution.
Silicone core – The silicone core is notably tender than an FKM. It’s also more temperature resistant (great flexibility in both high and low temperatures)

FKM core – FKM attributes great rubber manufacturing qualities. Its outstanding compression set allow it to re-assume to its original form after its deformation

FEP encapsulation – FEP (Fluorinated Ethylene Propylene) provides an O Ring with its immense features regarding its resistance to most games, chemicals and liquids (except liquid alkali metals and various fluorine compounds)

PFA encapsulation – PFA (Perfluoroalkoxy Copolymer) is similar to FEP in its application. It is remarkable due to superior cold flow attributes and improved mechanical features at risen temperatures.

Tolerances For ID

Encapsulated O Rings cannot be manufactured with the same tolerances as standard O Rings. They can deform due to the fluctuating inflexibility of the casino and the core because of temperature impacts.
For NCap® Seals, The O ring cross section will become oval with an enlargement of the axial cross section; and a reduction in the cross section to the radial axis. Without knowing the intended application, the only method that can be used to determine the correct dimension is to apply the average cross-section measurement from the axial and radial axis.

Kits

Encapsulated O Rings Metric and Imperial Kits, Splicing Kits & Top-up Bags are available

Bespoke Encapsulated O Ring Kits and selection Boxes are also available

Associated Products

O Rings, Encapsulated O Rings (FEP/PFA), Lube, Gauge / O Ring material tester, Quad Rings® (X-Rings) / Nu-lip Rings, Tube, Anti-extrusion Rings, Splicing Kits, Back-up Rings, O Ring Cord, Anti-extrusion Rings, Lubricants and Adhesives