ACX plywood is a version of a plywood panel that has a very specific makeup, with one rough face and one sanded face. It is often extended beyond traditional wooden plywood to include medium density fiberboard (MDF), particleboard, hardboard and chipboard. Arauca Ply Sanded ACX panels are laid up on a composed core using exterior PF resin and. The name “ACX Plywood” doesn't refer to a specific type of tree or wood, although all softwood plywood is made of some variety of pine, fir or. ACX and CDX are both exterior plywoods and aren't specifying the type of wood.