Feasibility of using eucalyptus wood and castor oil adhesive to produce OSB panels

Among the products that help in the industrialization of construction with technological and sustainable characteristics, wood panels stand out, which are related to a possible lower environmental impact associated with carbon fixation and replacement of non-renewable materials. Worldwide consumption of OSB (Oriented Strand Board) panels has increased, proving the relevance and consolidation of the use of this product. Therefore, it is necessary to study viable alternatives for traditionally used raw materials so that the composites produced present final properties compatible with regulatory specifications and meet the required technological requirements so that they can be safely applied as a construction component. In this context, OSB panels were produced with eucalyptus wood and castor-based polyurethane adhesive. Eucalyptus wood is a reforestation hardwood, with fast-growing and diverse species. Considering that traditional adhesives are among the main environmental hotspots in OSB production, castor oil-based adhesive is a potential alternative, as it is not produced using formaldehyde and comes from renewable sources. In this study, the physical and mechanical properties of the panels were evaluated (density, moisture content, swelling in thickness − 24h, water absorption, modulus of elasticity and strength in bending, internal bond, and resistance to axial withdrawal of screws). The average results were compared with the use classes indicated by Standard EN 300:2006, demonstrating that the panels produced are compatible with the classification as OSB/4 according to EN 300:2006 (Heavy-duty load-bearing boards for use in humid conditions), confirming the viability of production and presenting excellent structural performance.