What are the effects of prolonged water immersion on the buoyancy of WPC outdoor trash cans?

Prolonged water immersion significantly impacts the buoyancy of Wood-Plastic Composite (WPC) outdoor trash cans. Initially, WPC materials are known for their low water absorption rates compared to solid wood. However, when subjected to extended periods in water, such as during floods or persistent heavy rain, the plastic matrix can be compromised, allowing the wood fibers within the composite to absorb moisture. This absorption increases the overall density and weight of the trash can. While this added weight might seem to reduce buoyancy, the trapped water and air within the material's micro-pores can paradoxically contribute to floatation if the trash can is empty. The primary effect is not just a change in buoyancy but a potential loss of structural integrity. The absorbed water causes the wood fibers to swell, leading to dimensional changes, warping, or cracking. Over time, this cyclic wetting and drying can degrade the composite, reducing its lifespan and functionality. Therefore, while a waterlogged WPC trash can may become heavier, its tendency to float or behave unpredictably in water, combined with the risk of structural damage, makes prolonged immersion a critical factor to consider for placement in flood-prone areas. Proper installation and anchoring are recommended to mitigate these effects.