Medium-density fiberboard (MDF) is an engineered wood product formed by breaking down hardwood or softwood residuals into wood fibers, often in a defibrator and later combined with wax and a resin binder to form panels through the application of high temperature and pressure.
MDF differs from plywood in that it is denser. MDF is made up of separated fibers (not wood veneers) but can still be used as a building material similar in application to plywood. It is stronger and much more dense than normal particle board. The name derives from the distinction in densities of fiberboard.
The density is normally in the range 700–850 kg/m3, but can be as low as 600 kg/m3 or as high as 1200 kg/m3.
MDF does not contain knots or rings making it more uniform than natural woods during cutting. Notwithstanding, MDF is not entirely isotropic, since fibers are pressed together primarily through the sheet.
Like natural wood, MDF may split when woodscrews are installed without pilot holes. Moreover, MDF may be glued, doweled or laminated; however smooth-shank nails do not hold well. Typical fasteners include T-nuts and pan-head machine screws.
MDF, comes in 4’x8’ panels, with thicknesses ranging from 1/8” to 3/4”