How does the inclusion of glass fibers in WPC improve the stiffness of outdoor trash cans?

The inclusion of glass fibers in Wood-Plastic Composite (WPC) significantly improves the stiffness of outdoor trash cans by acting as a robust reinforcing agent within the composite matrix. Glass fibers, known for their high tensile strength and rigidity, are embedded into the WPC material, which is a blend of wood flour and thermoplastic polymers. When these fibers are added, they create a strong, interconnected network that resists deformation under load. This reinforcement directly combats the primary weakness of standard WPC—its relative flexibility—by distributing applied stresses more efficiently throughout the material. For an outdoor trash can, this translates to a structure that is less prone to bending, sagging, or warping when subjected to heavy waste or impact. The fibers effectively increase the composite's modulus of elasticity, a key measure of stiffness. This enhanced structural integrity ensures the trash can maintains its shape and functionality over time, even in demanding public environments, leading to greater durability and a longer service life.