What are the effects of high humidity on the mechanical properties of WPC outdoor tree boxes?

High humidity can significantly impact the mechanical properties of Wood-Plastic Composite (WPC) outdoor tree boxes. WPC materials, which combine wood fibers and plastic polymers, are popular for their durability and eco-friendliness. However, prolonged exposure to high humidity may lead to moisture absorption, causing swelling, reduced dimensional stability, and weakened structural integrity. Studies show that excessive moisture can degrade the bond between wood fibers and the polymer matrix, lowering tensile and flexural strength. Additionally, high humidity may accelerate fungal growth or warping, further compromising longevity. To mitigate these effects, manufacturers often incorporate additives or coatings to enhance moisture resistance. Understanding these challenges helps in designing more resilient WPC tree boxes for humid climates.