Masonite

Masonite, also called Quartboard or pressboard, is a type of engineered wood made of steam-cooked and pressure-molded wood or paper fibers. The fibers form a stiff, dense material in a range of weights.

The process was formulated and patented by American inventor William H. Mason.

Masonite has been widely used in traditional school and office products such as spiral-bound notebooks and three-ring binders, but its unique physical characteristics lend themselves readily to a variety of end-uses, including (but not limited to) document storage, filing supplies (classification and file folders), report covers, folding cartons, tags, labels, and industrial applications.