What is EPDM?
O rings EPDM are the abbreviation of Ethylene, Propylene, Diene, and Monomer and are a group of synthetic rubbers or elastomers. It’s made through the polymerization of tene, propene and a diene, this is an unsaturated hydrocarbon with two double bonds.
This makes an O-rings made of EPDM a terpolymer, this is a polymer obtained from three monomers.
The ratio between the amounts of the different monomers used largely determines the properties of the EPDM polymer. The ethylene content can vary from around 45 % to 80 %. Lower ethylene levels yield a rather amorphous polymer; higher ethylene levels a more crystalline polymer. The diene content can range from approximately 1 to 10 / 12 %. With higher diene content, a higher degree of vulcanization can be obtained, which means a "firmer" rubber.
What are O rings EPDM used for?
- In construction
- Roof covering
- Conveyor belts
Special EPDM O ring connections:
- Have good resistance to electricity
- EPDM - cured sulfur = cheap material for normal use. Maximum temperature of +120 °C (+250 °F)
- EPDM peroxide cured = for hot water, steam, alcohols, ketones, engine coolants, organic and inorganic acids, and bases. Not resistant to mineral oils, fats, and fuels. For maximum temperatures of +150 °C (+300 °F)
The advantages of EPDM O rings:
- It has a temperature working range from -45 °C to +150 °C
- It is flexible
- Good resistance to a lot of different acids
- Excellent resistance to heat, water, and steam
- Hardly aged and has a high ultra violet resistance, depending on the composition
The disadvantages of EPDM O rings:
- Not resistant to chlorine
- It’s not recommended for use in conditions with gasoline, petroleum, fats and hydrocarbon environments
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