ORIENTED STRAND BOARD (OSB) is a type of engineered wood similar to particle board, formed by adding adhesives and then compressing layers of wood strands (flakes) in specific orientations. OSB is a material with favorable mechanical properties that make it particularly suitable for load-bearing applications in construction. The adhesive resins types used include: urea-formaldehyde and poplar core (OSB type 2, nonstructural, waterproof). Isocyanate-based glue and (or PMDI poly-methylene diphenyl diisocyanate based) in inner regions with melamine-urea-formaldehyde or phenol formaldehyde resin glues at surface (OSB type 2, structural, water resistant on face). phenolic formaldehyde resin throughout (OSB 3, structural, for use in damp and outside environments).