The fines decompose and the topsoil absorbs the nutrients. A binder material such as polyethylene may be added to help the extrusion process, increase the energy value, and protect the pellets from breaking and absorbing moisture. A high quality, low dust wood pellet does not require a binder material. The moisture content of wood pellets is typically ten percent or less. Markets are also increasing for pellets used as absorbents such as pet litter.
Recycled wood is used as a reinforcing filler in thermoset plastics and thermoplastics.
This wood-plastic composite takes advantage of the strength of wood fiber and the heat and water resistive properties of the plastic. It may be produced by either extrusion or mat-forming technologies. Wood-plastic composites may be used for a wide variety of applications. For example, dimensional lumber with increased weather and rot resistance for use in decks or playground equipment and complex molding for the automotive industry. Dry wood waste particles or fibers are usually best suited for use in wood-plastic composites.