Ethylene-propylene compounds are prepared from ethylene and propylene (EPM) and usually a third monomer (EPDM). These compounds are used frequently to seal in brake systems, and for sealing hot water and steam. Ethylene propylene compounds have good resistance to mild acids, detergents, alkalis, silicone oils and greases, ketones, and alcohols. They are not recommended for applications with petroleum oils, mineral oil, di-ester lubricants, or fuel exposure.

Ethylene Propylene has gained wide seal industry acceptance for its excellent ozone and chemical resistance properties and is compatible with many polar fluids that adversely affect other elastomers.

EPDM compounds are typically developed with sulphur or peroxide cure system. Peroxide-cured compounds are suitable for higher temperature exposure and typically have improved compression set performance.

O-rings, rubber seals and custom moulded rubber components for:

Oil resistant applications

Oil well applications

Fuel systems, automotive, marine, and aircraft

General Industrial Use

Application Advantages

excellent weather resistance

good low temperature flexibility

excellent chemical resistance

good heat resistance

Application Disadvantages

• poor petroleum oil and solvent resistance

Modifications

sulphur-cured and peroxide-cured compounds

third co monomer EPDM, copolymer ethylene and propylene EPM

Specialized Applications

acrylonitrile content (ACN) from 18% to 50%

peroxide vs. sulphur donor cure system