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O-Ring Materials

The following provide basic guidelines for the materials composing O-rings supplied by Superior Seals & Service, Inc. These are only GUIDELINES. We urge you to perform tests on the o-rings you place into service to ensure they meet your specific requirement. If you have any questions, please consult our factory.

Aflas
This polymer has similar media compatibilities to EPR. However, it is compatible with and resistant to degradation due to contact with petroleum products.

Basic Temperature Service Range: - 20°F (-29°C) to 400°F ( 205°C)

In Typical Applications O-rings Come Into Contact With: Petroleum Fluids, Steam, Ammines, Brake Fluids, Phosphate Esters.


BunaN (Nitrile NBR)
This polymer has good resistance to hydrocarbons, petroleum, fuels, water (212°F), and ethylene glycol. It is poor in its resistance to ozone, weathering, and sunlight.

Basic Temperature Service Range: - 40°F (-40°C) to 250°F (122°C)

In Typical Applications O-rings Come Into Contact With:
Petroleum, Hydraulic Fluids, Water (212°F), Grease, Transmission Fluid.
EPR (EPDM) Ethylene Propylene Rubber
This polymer has good resistance to ozone, weathering, and sunlight. EPR possesses good heat resistance and low compression set. However, it is not resistant to petroleum products.

Basic Temperature Service Range:
- 65°F (-54°C) to 300°F (149°C)

In Typical Applications O-rings Come Into Contact With:
Steam, Hot Water, Chemicals, and Alcohol.
Fluorocarbon (Viton, Fluorel)
This polymer provides excellent resistance to temperature and chemicals. Fluorocarbon possesses low gas permeability, low compression set, and good mechanical properties.

Basic Temperature Service Range:
- 20°F (-29°C) to 400°F (205°C)

In Typical Applications O-rings Come Into Contact With: Chemicals, Heat, Fuels, Diester Lubricants, Halogenated Hydrocarbons (above 212°F).
Neoprene (Chloroprene)
This polymer is good in oil, ozone, and weathering. It is excellent in refrigerants such as Freon, but not good in phosphate esters, keytones, or brake fluids.

Basic Temperature Service Range:
- 65°F (-54°C) to 250°F ( 121°C)

In Typical Applications O-rings Come Into Contact With:
Freon, Air Conditioning Refigerants, Oils.
Silicone
This polymer has both excellent heat and low temperature capabilities. This material should be used as a static seal, because it has poor tensile and tear strength.

Basic Temperature Service Range:
- 80°F (-112°C) to 400°F (204°C)

In Typical Applications O-rings Come Into Contact With:
Dry Heat, Oxygen, Medical, Low Temperatures.
TFE Encapsulated (PTFE-FE) Silicone or Viton Core
These seals combine the chemical qualities of PTFE with the compression set of the rubber core encapsulated.

Basic Temperature Service Range:
- Established by the rubber core.

In Typical Applications O-rings Come Into Contact With:
Heat, Chemicals