Mechanical properties of MDP produced with wood particles of Ilex paraguariensis, Pinus elliottii e Eucalyptus grandis.

The present study aims to evaluate the feasibility of the use of wood residues from the industrialization of yerba mate (Ilex paraguariensis a. St hil.), for the manufacture of MDP panels, in combination with different proportions of wood of Eucalyptus grandis and Pinus elliottii, bonded with urea-formaldehyde. In order to carry out this research, wood residues of yerba mate and pine and eucalyptus wood particles. The mechanical tests of modulus of elasticity (MOE) and modulus of rupture (MOR) of static bending, pulling of bolts (AP), traction perpendicular to the surface of the panel (TP) and Surface resistance (RS). For this study we used the experimental model known as simplex centroid network planning, where it is possible to predict the behavior of a property from the results obtained with the use of each individual component. The modeling was manifested as follows: static bending MOR, AP and TP are determined by the linear model, whereas static bending MOE and RS are determined by quadratic model. In general, the addition of yerba mate particles has reduced most of the mechanical properties of MDP. However, only the treatment with 100% of yerba mate presented a performance lower than that required by the Brazilian standard ABNT - Brazilian Association of Technical Norms, in most of the tests performed. The most suitable proportion for the preparation of panels is the mixing of 33,33% of particles of each species. Therefore, it is concluded that the woody residue of yerba mate in combination with the species commonly used in commercial panels, pine and eucalyptus, can be used in MDP panels without harming the quality of the same.