What are the differences in screw retention strength between WPC and solid wood in planter assembly?

When assembling planters, the choice between wood-plastic composite (WPC) and solid wood significantly impacts screw retention strength. WPC, a blend of wood fibers and plastic, often exhibits lower screw retention due to its less dense and more flexible structure. In contrast, solid wood provides superior holding power because of its natural grain and higher density, ensuring screws remain firmly in place over time.

Testing reveals that screws in solid wood withstand higher pull-out forces, making it ideal for long-term stability. However, WPC resists moisture-related swelling and rotting, which can indirectly affect screw retention in outdoor settings. For optimal results, pre-drilling and using coarse-thread screws are recommended with WPC to enhance grip.

Ultimately, the decision depends on your priorities: solid wood for maximum screw retention or WPC for weather resistance and low maintenance.