In the framework of LIFE EcoTimberCell project, the characterization of the hardboard (Tablex) of Betanzos HB has been carried out, whose manufacture is characterized by not using artificial adhesives to link the wood fibers. They are high density wood fiber boards from local forests, one hundred percent ecological and sustainable. One of the objectives of the project is their incorporation into the EcoTimbercell structural systems, so their characterization seeks to adapt their performance to use with improved qualities of mechanical resistance, moisture and reaction to fire.