Solid co-extrusion durable WPC composites for outdoor applications are advanced materials designed through co-extrusion technology that combine a dense WPC core with a seamless polymer protective layer to provide superior durability and environmental resistance. The co-extrusion process enhances the interfacial bonding between the layers, improving water resistance and durability. Designed for harsh outdoor conditions, it has excellent resistance to UV radiation, moisture, extreme temperatures, and creep deformation.