... to water, damp, corrosion 4. CE SummaryCOOWIN Wood-Plastic Composite (WPC) railing is manufactured from a combination of plastic, natural fiber ... A HDPE, 10%~15% additivesSurface treating methodBrushing, sanding, embossing etcApplicationsGarden, park, landscape, villa, summer house, decoration, seaside railing etc.. Benefittraditional wood ...