Plywood boards are formed by stacking wood veneers, with opposite orientations to improve strength and stability, and applying glues for fixing them. This type of board has great resistance and depending on the treatment applied it can even be used in contact with water, so it is also known in some places as marine veneer, marine board. This possible resistance to moisture is due to the use of phenolic glues, so we speak of phenolic plywood.http://www.xingang-wood.com/mdf/