Medium-density fibreboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibres, often in a defibrator, combining it with wax and a resin binder, and forming panels by applying high temperature and pressure.MDF is generally denser than plywood and much denser and stronger than particle board. MDF does not contain knots or rings, making it more uniform than natural woods during cutting and in service. MDF may be glued, doweled or laminated.