OSB is Oriented strand board, is the upgrading of the traditional particleboard products, its mechanical properties with directionality, durability, moisture resistance and dimensional stability than ordinary particleboard. With a small expansion coefficient, no distortion, good stability, uniform material and nail holding high performance. Oriented strand board (OSB), also known as flakeboard, sterling board and aspenite in British English, 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/1 –  use in dry conditions OSB/2 – Load-bearing boards for use in dry conditions