This study considered the potential use of agro-industrial wastes like green coconut shell and sugarcane bagasse in order to add value to those materials, by mean fabrication of multilayer particleboards (3 layers: 2 external layers-EL and internal layer-IL), using castor oil-based polyurethane adhesive. The particleboards were evaluated using physic-mechanics tests: density, density profile, water absorption, thickness swelling, static flexure, dynamic flexural, perpendicular traction, screw pullout, Janka hardness and abrasion with the objective to verify the material characteristics and to indicate specific uses, microstructural: Scanning electron microscopy looking to identify microstructural characteristics of composite to interpret the physic-mechanics properties of product, durability: natural aging to expose the material to external environmental conditions and accelerated aging for exposure to indoor conditions. The residues used, the castor oil-based polyurethane adhesive and the parameters of production adopted; proved to be suitable for making multilayer particleboard of low (529 kg/m 3) and medium (692 kg/m 3) density. The thermal conductivity test allowed to classify the plates in the category of insulating materials with values between 0,14 e 0,17 W/m.K. The density profiles obtained made possible to observe the change of density along the thickness of the boards and showed differences between the homogeneous and multilayer sheets. The multilayer boards presented better physical and mechanical properties in comparison with the homogeneous particleboards and complied with the standards national and international. The results obtained after the natural and accelerated aging indicated that the plates being studied (homogeneous and multilayer) are sensitive to external exposure conditions (temperature, humidity and radiation) and to the extreme conditions of internal exposure (moisture and UVB radiation).
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