EPDM and silicone are common seal and gasket materials for both molded and extruded applications. 

EPDM is popular due its ability to perform in outdoor uses as it resists weathering, water and aging. It is regarded as a cost-effective material for a variety of industries. 

Silicone features excellent resistance to sunlight and oxidation, and it is a good electrical insulator. It also has an excellent compression set and can withstand high heat.  However, silicone is not recommended for applications that require abrasion, tear and cut growth resistance, or high tensile strength. 

Additional Considerations

Both EPDM and silicone are color stable, have excellent ozone resistance and maintain their flexibility at low temperatures. 

A notable difference is EPDM's ability to resist alkalis and acids, but neither material is recommended for resistance to oil or gasoline. 

To determine if EPDM or silicone is right for your application, the end-use function and a variety of physical, mechanical and chemical resistance properties must be considered. 

Cooper Standard ISG application engineers will work with you to review these decisions.

Contact us today to learn more.