*3.1.4 HDF*

If you are looking for an economical and reliable alternative to wood and plywood, boards made of wood fiber such as (high-density fiberboard) HDF and MDF are the best choice. Like MDF, HDF (high-density fiberboard) is a composite sheet made of pressed wood particles. HDF is a very thin sheet whose thickness generally varies between 3 and 8 mm. HDF is a man-made wooden product that is produced from the combination of wood chips impregnated with synthetic resins and adhesives. The mixture of these wood and resin particles is subjected to high temperature and pressure and becomes thin sheets with a thickness of less than 1 cm. The wood chips used in HDF are much more homogeneous than MDF and chipboard, which is why it has a higher density than them, around 900 kg/m3 [32]. HDF has a higher density compared to other types of fiberboard, such as medium-density fiberboard (MDF). This increased density gives HDF superior strength, durability, and resistance to moisture and impact. Due to its high density and strength properties, HDF provides excellent stability and structural integrity. It also has good screw-holding capacity and can be machined with sprecision. Additionally, HDF has low formaldehyde emissions compared to some other wood products. An example of HDF wood is shown in **Figure 5**.
