What are the effects of prolonged UV exposure on the resin matrix in WPC outdoor tree boxes?

Prolonged UV exposure significantly affects the resin matrix in Wood-Plastic Composite (WPC) outdoor tree boxes, leading to material degradation and reduced performance. The resin, a key component binding wood fibers and plastic, undergoes photo-oxidation when exposed to sunlight, causing discoloration, surface cracking, and loss of mechanical strength. Over time, UV radiation breaks down the polymer chains in the resin, weakening the composite's structural integrity. This degradation accelerates in harsh climates, shortening the lifespan of WPC tree boxes. To mitigate these effects, manufacturers often add UV stabilizers or protective coatings, but long-term exposure still poses challenges for outdoor durability. Understanding these impacts helps in selecting and maintaining WPC products for outdoor use.