Oriented Strand Board (OSB) is a widely used, versatile structural wood panel made from reconstituted, mechanically oriented wood strands which are bonded together under heat and pressure using a waterproof phenolic resin adhesive or equivalent waterproof binder. OSB makes efficient use of forest resources, by employing less valuable, fast-growing species like aspen, poplar and southern yellow pine. The manufacturing process can also make use of crooked, knotty and deformed trees which would not otherwise have commercial value, thereby maximizing forest utilization.
The strands in the outer faces of OSB are oriented along the long axis of the panel thereby, like plywood, making it stronger along the long axis as compared to the narrow axis. The strands in inner layers are oriented either perpendicular to the longitudinal axis or randomly. This results in a structural engineered wood panel with improved stiffness and strength properties and dimensional stability.
The strands used in the manufacture of OSB are generally up to 150 mm (6”) long in the grain direction and 25 mm (1″) wide and less than 1 mm (1/32″) in thickness.
OSB is most often diverted towards Recycling or Waste to Energy markets.
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