UV resistance refers to a rubber material’s ability to withstand ultraviolet (UV) radiation from sunlight or artificial sources without degrading. Exposure to UV rays can cause oxidation, cracking, discoloration, and loss of mechanical properties in many rubber compounds over time.

Effects of UV Exposure on Rubber

1. Surface Cracking (UV Degradation)

   • UV rays break down polymer chains, causing brittleness and cracks on the rubber surface.

2. Loss of Elasticity & Strength

   • Prolonged UV exposure reduces tensile strength and flexibility, making rubber weaker and more prone to failure.

3. Discoloration & Fading

   • Some rubber types turn chalky, faded, or yellowed due to UV-induced chemical changes.

4. Oxidation & Hardening

   • UV light accelerates oxidation, leading to a stiffer and less resilient rubber product.

How to Improve UV Resistance in Rubber

• Use UV-Stable Elastomers: EPDM, silicone, and fluoroelastomers naturally resist UV degradation.

• Add UV Stabilizers & Antioxidants: Carbon black, titanium dioxide, and chemical stabilizers absorb or reflect UV rays.

• Use Protective Coatings: UV-resistant paints or sealants can shield rubber from direct sunlight.

• Limit Outdoor Exposure: Storing rubber products in shaded or indoor environments extends their lifespan.

Applications Requiring High UV Resistance

• Automotive: Weatherstripping, wiper blades, and door seals.

• Construction: Roofing membranes, window gaskets, and outdoor insulation.

• Industrial: Conveyor belts, outdoor machinery parts, and electrical cables.

• Aerospace & Marine: Seals and gaskets exposed to harsh environmental conditions.

Conclusion

UV resistance is crucial for rubber materials exposed to sunlight or high-intensity UV radiation. While EPDM, silicone, and fluoroelastomers offer excellent UV stability, other rubbers like natural rubber and SBR require additives or coatings for protection. Choosing the right rubber formulation ensures long-term durability and performance in outdoor and high-exposure applications.