Wood Plastic Composites

The introduction of Wood Fibers into polymers at levels between 30% and 65% helps define the natural fiber-reinforced compounds segment known as Wood Plastic Composites (WPC). While historically the polymers used in this space have been Commodity Thermoplastics such as PP, PE, and PVC, the compounders have been expanding to Engineered Thermoplastics (Polyamides & Polyesters) to open new and unique markets. The natural fibers used in WPC compounds will vary by application and can include not only wood flour but also fibers from bamboo, coconut, hemp, and rice hulls. To improve the compatibility of these fibers to the polymer matrix, and to enhance the physical and biological attributes of the finished products, many additives have emerged specifically focused on WPC. Focus has been steered towards lubricating extrusion aids, moisture absorption inhibitors, coupling agents, impact modifiers, colorants, and more recently cap-stock enhancers.