MDP (medium density particleboard) panels are normally graded in composition along their cross-section, using low-size particles and high concentration of adhesive on the particleboard surface (leading to improved physical and mechanical properties), and high-size particles in the particleboard core (interior), which provide higher porosity. Then, the aim of this study was to evaluate the impact of using different contents of bamboo particles in the particleboard core, on their physical and mechanical properties. The production of the panels was carried out using Pinus oocarpa (P) and Bambusa vulgaris var. Vittata (B) particles in different contents (100% P, 100% B, 50% de B e 50% de P, 25% de B e 75% de P, 75% de B e 25% de P) in the core of the particleboards. The face of the particleboards were composed of P particles. The panels were produced with nominal density of 0.70 g/cm 3 , 40:60 face:core relation, 11% urea-formaldehyde adhesive in the faces and 8% adhesive for the core, specific pressure of 3.92 MPa, 160 °C temperature and pressing time of 8 min. After seasoning, the panels were submitted to evaluation of the thickness swelling (TS) and water absorption (WA) after 2 and 24 h of immersion, apparent density (AD), internal bonding (IB), modulus of rupture (MOR) and modulus of elasticity (MOE) under static bending. There was no statistical difference between the treatments for AD, IB, MOR and MOE values. Panels produced with high contents of bamboo particles (100% B, 75% B e 50% B) in the core, presented the lower WA and TS values, leading to improved dimensional stability than panels with only pinus particles. The present results show the important impact of using functionally gradation and bamboo particles on the physical properties of the MDP panels produced. Introduction Currently, the industries of reconstituted wood panels use wood originated from planted forests, mainly of the genus Pinus and Eucalyptus in its production process. However, with the growth of the sector, it is necessary to search for fast-growing species that can contribute to addressing the needs of industries as well as contribute to the development and creation of new products. Bamboo is a interesting vegetable raw-material that has been intensely studied for developing of new products, because it shows rapid growth and presents high specific strength (strength/density) [1,2,3]. In this context, the production of MDP (medium density particleboard) panels using bamboo particles appears to be quite interesting. One advantage of this type of panel is the possibility of using various types of lignocellulosic sources as raw materials, as consequence of their high mechanical and biological resistance [4,5]. Brazil presents high diversity of bamboo species and the highest rate of endemic bamboo forests throughout Latin America. However, its potential has been still little explored [6].