POLYWOOD® lumber is made from high-density polyethylene (HDPE), UV-inhibited pigment systems, foaming compounds, and selected process additives. The HDPE primary raw material is derived from post-consumer bottle waste, such as milk and detergent bottles or other HDPE post industrial material. This material is cleaned by a decontamination process to a high purity level, which removes contaminants such as food residue, paper, and adhesives. It is then compounded into a rigid board stock material; with the resulting finished product containing over 90% recycled plastic by weight.
Because HDPE products are made with a single, purified polymer, they are manufactured to exacting, reproducible specifications. They have exceptional resistance to corrosive substances, oil and fuels, insects, fungi, salt spray, and other environmental stresses. They do not absorb moisture; therefore, they will not rot, splinter, or crack. HDPE products have excellent weathering resistance; however, as with other polyolefins, it is possible that the material will fade slightly over the service life of the product. These products require no water proofing, painting, staining, or similar maintenance when used in many exterior applications.