WPC decking board is made of bamboo, plastic and chemical additives. The decking board is used for outdoor, water proof. The Eco-friendly wood plastic composite decking board we produced is made of:30% HDPE (Grade A Recycled HDPE)60% bamboo/wood fiber (Professionally treated dry bamboo/wood fiber)10% chemical additives (Anti-UV agent, Anti-oxidation agent, stabilizers, colorants, anti fungus ...