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Spring Energised seals are single acting seals which are used for dynamic and static applications.

They are effective in a wide range of applications.

They are chosen when higher resistance to chemical media is required, if the seal is required to operate in extremes of temperature and where good extrusion and compression characteristics are needed.

Spring Energised Seals have three main design characteristics:

  • Application specific U-shaped seal profile
  • Spring geometry suited to a particular application
  • Proven high-performance polymers

Standard products are available from 2 mm up to 2500 mm (8′ 2″) in diameter along with custom Manufactured intermediate sizes, inch (imperial) sizes or special geometries.

Method of Operation

All seals have the same operating principle and differ only in their profile form and type of metallic spring used.

The spring supplies the load required for sealing at low pressures.

The “U” shaped jacket allows fluid pressure to energize the sealing lips, so total sealing pressure rises with increasing operating pressure Spring Force.


The different types of seal combined with the properties of materials offer design engineers a wide range of solutions to suit a large number of applications.

The most important characteristics of Spring Energised Seals are listed below:

  • Very low coefficient of friction
  • Good dynamic and static sealing
  • Capable of sealing at high speeds up to 15 m/s (49 ft/sec)
  • Almost universal chemical compatibility
  • Operating temperature of -253 °C up to +300 °C (423 °F to 572 °F)
  • Very good thermal resistance Permanent elasticity unaffected by contact with chemicals
  • Good ageing characteristics Low compression set
  • Capable of withstanding high pressures above 200Mpa (2000 bar, 29000 psi) when using Back-up Rings
  • Very good dry-running properties

Choosing the right seal for your application Spring Energised seals offer major benefits in the design of components such as hydraulic and pneumatic cylinders, in all industries.

These include:

  • Excellent leak tightness High resistance to wear
  • No extrusion into gaps
  • Withstanding aggressive and abrasive process media
  • Very good temperature capabilities
  • Low friction Compact form Simple installation

These seals are available in a range of geometries and designs that allow the optimum profile to be selected for each application.

They can be produced from a wide range of PTFE based compounds.

These are specially formulated for sealing elements and offer superior characteristics specifically matched to the demands of our customers.

When required, Spring Energised seals can also be manufactured in polyethylene-based material.

To choose the best seal for your application, you must first decide the functional parameters.

It is also important to consider the quality of the mating surface, which has a significant effect on the function and service life of the sealing system.


The company is registered to ISO 9001-2015, our certificate is available to download. In addition, the company operates its own Quality Policy and a programme of "Continuous Improvement" The company is also a Member of the British Standards Institute, our certificate of membership is available to download


quality certificate

Contact Us


Junction 19 Industrial Park,

Green Lane, Heywood,

Gr. Manchester,

OL10 1NB


01706 624 422

©2024 EAP Seals Ltd. Junction 19 Industrial Park, Green Lane, Heywood, Gr. Manchester, OL10 1NB. England