HolzPolymerVerbundwerkstoffen

HolzPolymerVerbund, commonly referred to as a wood-polymer composite (WPC), is a class of materials that combines wood flour or fibers with a thermoplastic polymer matrix to yield a wood-like product with enhanced durability. The wood component is typically recycled or sustainably sourced, while the polymer matrix is usually polyethylene, polypropylene, or sometimes polyvinyl chloride. Additives such as coupling agents, UV stabilizers, colorants, and antioxidants are used to improve bonding, weather resistance, and appearance.

Manufacturing methods include extrusion, injection molding, and compression molding. In these processes, wood flour or fibers are dispersed in the molten polymer and formed into boards, profiles, or molded parts. The resulting material offers greater stiffness and dimensional stability than natural wood, along with improved moisture resistance and decay protection, while maintaining a wood-like aesthetic.

However, WPCs can exhibit lower screw withdrawal strength than many hardwoods, potential surface wear or fading over time, and sensitivity to heat and UV exposure if stabilizers are inadequate. They may also have higher initial cost and can be difficult to recycle if composed of mixed polymers or additives.

Applications are broad, with outdoor decking and railing as the most common use, as well as fencing, exterior trim, and some automotive interiors or molded components. Environmental considerations depend on material sourcing and end-of-life options; many WPCs incorporate recycled plastics and wood fibers and can be recycled or reprocessed, though recycling streams vary by region.