NEWS CENTER

EPDM (Ethylene Propylene Diene Monomer) rubber is a synthetic rubber material widely used in seal applications due to its excellent resistance to weathering, ozone, and heat. However, over time, EPDM rubber seals can experience aging, which can lead to degradation in their sealing performance. Here are some common causes of aging in EPDM rubber seals:

1. Oxidation: Exposure to oxygen and heat can cause oxidation of the rubber, resulting in the formation of peroxides and free radicals. These reactive species can attack the rubber chains, leading to chain scission and cross-linking, which ultimately lead to material degradation.

2. UV Radiation: Extended exposure to ultraviolet (UV) radiation from sunlight can cause photo-oxidation of EPDM rubber. UV radiation generates reactive species that attack the rubber chains, leading to degradation.

3. Thermal Degradation: High temperatures can accelerate the degradation process of EPDM rubber. Heat can trigger chemical reactions that lead to chain scission and cross-linking, reducing the mechanical properties of the material.

4. Ozone Exposure: Ozone is a powerful oxidizing agent that can react with double bonds in the rubber structure, leading to chain scission and degradation.

5. Chemical Exposure: Exposure to certain chemicals, solvents, and oils can cause chemical degradation of EPDM rubber. These chemicals can attack the rubber chains, leading to damage and loss of sealing performance.

6. Mechanical Stress: Constant mechanical stress, such as compression, bending, and stretching, can cause fatigue and microcracking in the rubber, leading to premature failure.

7. Water Absorption: EPDM rubber can absorb water, which can lead to swelling and softening of the material. Water absorption can also accelerate the degradation process by promoting the formation of reactive species.

To mitigate the effects of aging, it is important to select appropriate EPDM rubber grades that are resistant to the specific environmental conditions and chemicals encountered in the application. Additionally, proper installation, maintenance, and replacement of seals at recommended intervals can help extend their service life.