Mixtures of Pinus radiata D. Don back and wood particles for the production of particleboards were studied. Single layer boards with the following processing parameters were manufactured: Board thickness: 11 mm; Board density: 650 kg/m3 ; Adhesive content: 8% urea-resin solids, based on ovendry weight of particles; Bark content (%): 0; 10; 25; 40; 55; 70; 85 and 100%. A high correlation between mechanical and physical properties and board bark content was found. The observed trend shows that bark inclusion has a negative effect on mechanical properties, while the physical properties improve.