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Quad Rings®
Oil Seals
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H-Seal (Metal Seal)
Custom Metal Fabrication

Bostec's revolutionary H-Seal are the most reliable, flexible and cost effective metal seals in existence. H-Seal™ provide an ultra high vacuum (UHV) seal that is particle free, impermeable to moisture and are interchangeable with elastomeric O-rings. Learn more about H-Seal ...

Guaranteed 100% reliable
Interchangeable with Elastomeric O-Rings
Cryogenic to 500+° C
Sizes from 0.300" to 14"
Available in Nickel, Aluminum, Copper


All Seals Incorporated
The Sealing Specialists
2110 S. Yale Street
Santa Ana, CA 92704
Phone: (714) 556-4931
Fax: (714) 557-3257


Ethylene Propylene
Ethylene Propylene Rubber (EPM, EPDM)

Typical Trade Names:

  • Nordel - E.I. duPont de Nemours Co.
  • Royalene - Uniroyal
  • Vistalon - Exxon Chemical Co. USA
  • Epsyn - Copolymer Rubber & Chemical Corp.
  • Epcar - B.F. Goodrich Co.

Ethylene propylene rubber is an elastomer prepared from ethylene and propylene monomers (ethylene propylene copolymer) and at times with a small amount of a third monomer (ethylene propylene terpolymers). Although EP is a relatively new introduction to the rubber industry (1961), it has won broad acceptance in the sealing world because of its excellent resistance to Skydrol and other phosphate ester type hydraulic fluids. Ethylene propylene has a temperature range of -65 to +300 degrees F (-54 to +149 degrees C) for most applications.

EP is recommended for:

  • Phosphate ester base hydraulic fluids (Skydrol, Fyrquel, Pydraul)
  • Steam (to 400 degrees F) (204 degrees C)
  • Water
  • Silicone oils and greases
  • Dilute acids Dilute alkalles
  • Ketones (MEK, acetone)
  • Alcohols
  • Automotive brake fluids

EP is not recommended for:

  • Petroleum oils
  • Di-ester base lubricants

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We can supply custom gaskets designs in any material and in virtually any shape or size. Gaskets can be die cut (steel rule or harden compound), molded, extruded, water jet cut or laser cut. Send your drawings for quote or call to discuss product or material design perimeters with our engineering department.


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