Plywood is a manufactured panel made up of three or more thin plies (layers) of wood. Each ply is laid down with its grain running perpendicular to the one before it. Like other glued-wood products, plywood provides a strong, inexpensive alternative to solid wood. It is widely used both in cabinetmaking (for chests, dressers, wardrobes, and tables) and in house construction (for walls, ceilings, subfloors, doors, and in forms for casting concrete).
Veneer is thin surface layer, as of finely grained wood, glued to a base of inferior material. It is a decorative facing. Veneers are glued to the top of thick lumber to make veneered wood, glued to paper for wall coverings or glued to other veneers as in plywood and laminates.
Laminated wood is usually built by the parallel gluing of lumber boards in a variety of sizes and shapes according to intended use. It can be used to fabricate large members that are impossible to make from solid wood. The individual boards used in laminated wood , because of their relative thickness , can be properly dried without checking( cracking), and defects , such as knots, can be removed.
Particle board is another wood based boards, is manufactured of particles of wood glued together. Variation in such characteristics as particle morphology and arrangement, method of production, board thickness (2–40 mm [about 0.08–1.6 inches]), presence of perforations, and type and amount of adhesive allow the production of particleboards with different properties. They are classified as low-density (used for insulation), medium-density, and high-density. Low- and high-density boards are rare.
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