How does resin degradation under UV light affect WPC flower box structural integrity?

Resin degradation under UV light is a critical factor affecting the structural integrity of Wood-Plastic Composite (WPC) flower boxes. When exposed to prolonged sunlight, the resin matrix in WPCs undergoes photochemical reactions, leading to chain scission, loss of mechanical strength, and surface cracking. This degradation weakens the composite's load-bearing capacity, making it prone to warping or breaking under stress.

UV radiation breaks down the polymer bonds in the resin, reducing its ability to bind wood fibers and plastic components effectively. Over time, this results in increased brittleness, color fading, and reduced resistance to moisture and impact. To mitigate these effects, manufacturers often add UV stabilizers or protective coatings to WPC flower boxes, enhancing their outdoor durability. Understanding this degradation process helps in selecting high-quality WPC products for long-term use in garden and patio settings.