Extreme Seals


Hostile chemical environments and extreme temperatures can have devastating effects on most standard polymers. Teflon encapsulated o-rings are used in applications that prohibit the use of conventional elastomers. The applications usually entail very hostile chemical environments, extreme temperatures or both. Encapsulated o-rings are availiable in 2 different elastomer cores,silicone (Vmq) and fluoroelastomer (Fkm). The outer jacket can be supplied in either Teflon FEP (fluorinated-ethylene propylene) or Teflon PFA (perfluoroalkoxy).

Applications: Chemical processing, Pharmaceutical Manufacturing, Food and Drinks, Paint and Dyes, Cosmetics and Refrigeration. Additonal material information is available upon request. 

Most standard combinations utilize an FEP jacket but a PFA outer casing adds extra abrasion resistance.

Encapsulated components can be made in a variety of shapes to suit a wide range of housings and applications.

The most popular shape is circular but oval and semi circular cross sections are also available for manhole and hatch seals as well as heat exchanger tube seals.

Square and rectangular cross sections are also available for pump case seals and heat exchanger plate seals.

All corners must be radiused.

Typical markets for these products are:

  • Chemical Processing
  • Refineries
  • Pharmaceutical Manufacturing
  • Paints and Dyes
  • Refrigeration

The relatively low cost of encapsulated seals used in these industries is accelerating their increased adoption and use.


Perfluoroelastomers deliver the highest performance of any elastomer. They are designed for use in aggressive chemical environments and they resist attack to nearly all chemical reagents. They are more expensive than encapsulated parts but show outstanding compression set in almost every condition thereby offering an advantage over encapsulated parts in some critical applications.

Virgin PTFE

The only material that offers true chemical inertness. PTFE is unaffected by all known chemicals but this is it's only advantage. PTFE suffers badly from "cold flow" and as such is not suitable as a compression seal. PTFE is however, a less expensive choice versus perfluoroelastomers in some applications.

For more information on these products, please contact us.

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