Demo F focuses on reusing secondary fibres from post-consumer wood in the production of medium- and high- density fibreboard (MDF and HDF). The goal is to replace up to 25% of virgin fibres while maintaining board quality. The demo also involves adapting production methods and running industrial-scale trials. The new fibreboards are tested for performance, safety and environmental impact to meet EU standards. In this way, high-quality fibreboards can be produced with a significant share of recycled fibres, increasing circularity in the panel industry while reducing reliance on virgin wood.