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OSB is a type of engineered wood made from compressed layers of wood strands. It is similar to particle board, but the strands are oriented in specific ways to give it strength and stability.

18mm OSB 3 may have a rough and variegated surface with the individual strips of around 2.5 cm × 15 cm (1.0 by 5.9 inches), lying unevenly across each other, and is produced in a variety of types and thicknesses.