How does the addition of mineral fillers affect the density and cost of WPC outdoor trash cans?

The addition of mineral fillers, such as calcium carbonate or talc, is a common practice in manufacturing Wood-Plastic Composite (WPC) outdoor trash cans. This process primarily affects the product's density and overall cost. Regarding density, mineral fillers are inherently denser than the wood flour and plastic polymer matrix of the base WPC. Therefore, their incorporation increases the composite's overall density. This results in a heavier, more substantial-feeling trash can, which can enhance perceived quality and improve resistance to wind tipping. However, it may also make the product less portable.

The most significant impact is on cost. Mineral fillers are substantially cheaper than both the plastic resin (like PE or PVC) and the processed wood fiber used in WPCs. By replacing a portion of these more expensive raw materials with low-cost mineral fillers, manufacturers can achieve a considerable reduction in the material cost per unit. This makes WPC trash cans more economically viable to produce and purchase. It is a strategic balance; while higher filler content lowers cost, it can potentially reduce certain mechanical properties like impact strength if not properly optimized. Therefore, manufacturers carefully calibrate the filler ratio to achieve an optimal balance between cost-effectiveness, density, and long-term performance for outdoor use.