The compacted felts are also produced through the needle-punching process of the polyester flakes but undergo a second processing. They are re-compacted by machine without the aid of glues or chemical binders that could contaminate the product. This process is able to produce non-woven fabrics with a unique compactness of its kind, able to develop the best resistance to compression given by external pressures. During the working phase it is possible to find a better propagation of the air flow inside them, thus eliminating the risk of collapse of the felt. However, the greater compactness of the product modifies its drapability, which in any case remains optimal for practically all production processes in the sector of reinforced plastic materials, in the glass industry and in all fields in which needle-punched fabrics are usually used.