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 a sulfur or peroxide cure system. Peroxide-cured compounds are suitable for higher temperature exposure and typically have improved compression set performance.
Temperature Range (dry heat)
low
high
-40 °F -40°C
300 °F 149 °C
Application Advantages
» excellent weather resistance » good low temperature flexibility » excellent chemical resistance » good heat resistance
Application Disadvantages
» poor petroleum oil and solvent resistance
Modifications
» sulfur-cured and peroxide-cured compounds » third comonomer EPDM, copolymer ethylene and propylene EPM
Primary Uses
Specialized Applications
O-rings, rubber seals and custom molded rubber components for: » Water system seals, faucets, etc. » Brake systems » Ozone exposure applications » Automotive cooling systems » General Industrial Use
» glycol-based brake system seals » FDA approved applications » NBR NSF standard 61 for potable water applications » NBR WRc, KTW water applications
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