There has been a rapid growth in the extrusion business with the use of wood-filled compunds for buildings and construction. The better provision for longevity, appearance, life-cycle cost and value makes wood-plastics composites popular in use in the markets. Wood-plastics are resistant to insect, rotting, slip and are attractive and paintable and are stiffer than plastics and used like wood. The extruder composites can eliminate sizing and calibration. This is because the stiff extrudate can hold its shape much better than unfilled plastics.