Peroxide-cured EPDM o-rings are a type of seal commonly used in industrial and automotive applications. They are known for it's excellent resistance to heat, ozone, and weathering. Peroxide curing is a process in which a small amount of peroxide is added to the EPDM rubber during the manufacturing process. This process results in a more durable and resilient seal. These o-rings have improved compression set resistance, high temperature resistance and excellent resistance to ozone, weathering, and chemicals. They are commonly used in automotive and industrial applications such as engine seals, transmission seals, and hydraulic systems.