How does the addition of zinc borate to WPC improve resistance to fungal decay in planters?

The addition of zinc borate to Wood-Plastic Composite (WPC) significantly improves its resistance to fungal decay, making it an ideal material for planters exposed to moisture and organic matter. Zinc borate acts as a biocide, inhibiting the growth of fungi and mold that thrive in damp environments. When incorporated into WPC, it forms a protective barrier that prevents microbial degradation, extending the lifespan of planters. This additive also enhances dimensional stability and reduces water absorption, further minimizing conditions favorable for fungal growth. As a result, WPC planters treated with zinc borate maintain structural integrity and aesthetic appeal even in humid or wet climates, offering a durable, low-maintenance solution for outdoor gardening.