It is generally agreed that a WPC is a mixture of a thermoplastic, such as polyethylene (commonly used to make plastic toys and milk containers, plus a lot of other products), with wood flour or fiber, with at least 40 percent of the composite being wood. All the current products are formed by extrusion. A hot mixture of plastic and wood particles plus a variety of additives are squeezed through a die, like toothpaste out of a tube, then through a cooling section to harden the plastic. The continuous extruded product is cut to appropriate lengths, usually 16 feet. The shape of the die determines the cross-sectional shape of the deck board.
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