Wood-plastic composite is made of recycled plastic including polyethylene, polypropylene, polyvinyl chloride, etc. and wood waste and is used as exterior cladding (Figure 15.9).The wood waste is reduced to sawdust and mixed with the polymer to a dough-like consistency and then extruded or moulded to the desired shape. Colour pigments and ultraviolet stabilizers are often added.The product probably needs less maintenance than wood cladding; at least during the first years, and it does not rot. Wood plastic composites can be regarded as a sensible way to delay the final energy-recycling ordumping of used plastic products.
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