PLYWOOD
Plywood is a material manufactured from thin layers or "plies" of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another. It is an engineered wood from the family of manufactured boards which include medium-density fibreboard (MDF), oriented strand board (OSB) and particle board (chipboard).All plywoods bind resin and wood fibre sheets (cellulose cells are long, strong and thin) to form a composite material. This alternation of the grain is called cross-graining and has several important benefits: it reduces the tendency of wood to split when nailed at the edges; it reduces expansion and shrinkage, providing improved dimensional stability; and it makes the strength of the panel consistent across all directions
Plywood Usage
plywood has inherently good strength properties that can be engineered for certain uses. In structural terms, plywood can be used for partitions, floors, ceilings and sheathing. It is also used for decorative purposes both in exterior positions, such as cladding and doors, and internally as cabinets, shelves and furniture. The highest specification of plywood is used for marine environments, such as boats and docks—this uses veneers made from durable wood species, for example, okoume and PF resins. Requirements for untreated tropical hardwood veneers and glues for marine grade plywood are specified in the European standards/p>
