How do UV inhibitors in polyethylene planters degrade over time with sun exposure?

Polyethylene planters are widely used for their durability and lightweight properties, but prolonged sun exposure can degrade their UV inhibitors, leading to material breakdown. UV inhibitors are additives designed to absorb or block ultraviolet radiation, preventing the plastic from becoming brittle and discolored. However, these inhibitors are not permanent—over time, continuous UV exposure depletes their effectiveness through photochemical reactions.

As sunlight breaks down the inhibitors, the polyethylene polymer chains become vulnerable to oxidation, causing cracks, fading, and reduced structural integrity. Factors like climate, UV intensity, and inhibitor quality influence degradation rates. Regular maintenance or UV-resistant coatings can extend the lifespan of polyethylene planters. Understanding this process helps gardeners and manufacturers make informed choices for long-lasting outdoor products.