Wood panel products are flat, sometimes curved, sheets made from wood-based materials that are bonded together with an adhesive.   Panels are typically made of veneer, strands, particles or fibers and bonded with a synthetic or other adhesive cured using heat and pressure. The properties of the panel product are a result of the character of the wood raw material, the adhesive, additives, and the details of the manufacturing process.  The most commonly produced wood panel products are plywood, oriented strand board, particleboard, and fiberboard.  Other wood-based composite materials may be produced in panel form for specialized applications and markets.Wood panels may be categorized as structural or non-structural.  Structural panels are designed and manufactured to resist forces and play specific roles in structural systems such as houses, buildings, concrete formwork, shipping containers and unit load platforms, etc.