MDF mouldings are manufactured from medium density fiberboard. These mouldings are used in paint-grade interior applications. The manufacturing process insures a uniform consistency without the imperfections that may exist in other paint-grade products. MDF does not warp or split and does not expand and contract like natural wood species. MDF has a hard surface that will not damage easily and that will not show raised grain. MDF Mouldings are usually primed and there is very little surface preparation required for finishing. They are less expensive than other wood paint-grade Mouldings, especially in larger architectural profiles.