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FEP Encapsulated O-rings

FEP, PFA or PTFE Encapsulated O-rings consist of a Viton® (FKM) or Silicone (VMQ) rubber core with an fluoroplastic-encapsulation. The elastomeric core offers great resilience while the fluoroplastic encapsulation protects the core from chemical and thermal attack. Encapsulated rings are a great cost effective alternative to FFKM O-rings.

Suitable for

  • Static and light dynamic applications.
  • Applications that require a high level of chemical resistance.

Not suitable for

  • Small cross sections >1.5mm.
  • Applications where a low closing force is available.
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FEP encapsulated o-ring close up
FEP encapsulated o-ring close up

Advantages

  1. High chemical resistance
  2. High temperature range
  3. Low friction
  4. No stick slip effect in dynamic applications
  5. Can be used as retrofit in standard O-ring grooves

How do Encapsulated O-Rings work?

How do encapsulated o-rings work

Encapsulated O-rings work the same as regular O-rings. An O-ring is an elastic part placed between two parts and then squeezed to fill up the gap between the two parts. When placed under pressure, the ring is forced to “flow” within the groove toward the clearance gap. As the ring flows against the gap, it produces zero clearance and prevents the sealed substance from escaping. The difference between a regular O-ring and a Encapsulated ring is the fact that the encapsulation brings improved chemical resistance, but the ‘compression set’ or memory of the seal is lower.

Technical Specifications

Movement type

Static, Light dynamic

Available sizes

Any size available upon request

Pressure range

≤ 100 bar

Temperature range

Silicone + FEP:

-60° to +200° C

Silicone + PFA:

-60° to +260° C

FKM + PTFE:

-60° to +200° C

Available materials

O-ring:

VMQ, FVMQ, FKM, FFKM, NBR, CR, EPDM, HNBR, PU

Encapsulation:

FEP, PFA, PTFE

Available compliance

WRAS, FDA

Encapsulated O-Ring Types

FEP encapsulated silicone o-ring profile

FEP Encapsulated Silicone (VMQ)

The most commonly used encapsulated seal type. The silicone core provides resiliency, while the FEP encapsulation offers chemical protection and great thermal resistance.

Advantages:

  • High chemical resistance
  • Broad temperature range
  • No Stick slip effect
FEP encapsulated silicone o-ring profile

PFA Encapsulated Silicone (VMQ)

Advantages:

  • High chemical resistance
  • Broad temperature range
  • No Stick slip effect
  • Improved heat resistance
  • Low gas permeation
FEP encapsulated hollow silicone o-ring profile

FEP Encapsulated Silicone (VMQ) Hollow Core

The hollow core of this encapsulated seal type allows successful sealing with less compression force. Excellent for use in low pressure applications and applications where low sealing force is available.

Advantages:

  • High chemical resistance
  • Broad temperature range
  • No Stick slip effect
  • Low closing force
PTFE encapsulated FKM o-ring profile

PTFE Encapsulated FKM

The PTFE encapsulated FKM O-ring has superior chemical properties, very low permeability and low friction coefficient. The PTFE encapsulation offers longer lifetime in comparison to FEP/PFA.

Advantages:

  • High chemical resistance
  • Broad temperature range
  • No Stick slip effect
  • Improved friction coefficient

Rubber Core Materials

Rubber Material Characteristics Performs well in Does not perform well in
VMQ, Silicone
KE®, Silastic®, Silplus®, Tufel®

Temperature range:

-54° to +232° C

Weather resistance:

Ozone resistance:

Relative Cost:

  • Water
  • Cold
  • Dry heat
  • Low temperatures
  • Ozone & weathering
  • Abrasion
  • Dynamic applications
  • Acids and alkalis
  • Aromatic mineral oil
  • Steam (>120° C)
  • Hydrocarbon based fuels
FKM, Fluorocarbon
Viton®, DAI-EL®, Dyneon®, Tecnoflon®

Temperature range:

-25° to +204° C

Chemical resistance:

Ozone resistance:

Relative Cost:

  • High temperatures
  • Solvents
  • Petroleum oils
  • Most chemicals
  • Low temperatures
  • Amines
  • Ketones

Contact Us

We believe in the quality of our products and service. Fill out the form and one of our skilled engineers will contact you within the next business day.

Contact details

  • +31 (0) 226 362 233
  • info@newdealseals.com
  • Energiestraat 2-5, 1749 DN Warmenhuizen, Nederland