Plywood

thumb|300px|Softwood plywood made from [[spruce]] thumb|300px|The principle of making plywood

engineered wood product that uses multiple layers of thin wood assembled with adhesives

right|thumb|The Hughes H-4 Hercules, made of birch ply Duramold thumb|Samples of Duramold at the Evergreen Aviation & Space Museum Duramold is a composite material process developed by Virginius E. Clark. Birch or poplar plies are impregnated with phenolic resin and laminated together in a mold under heat (280 °F, 138 °C) and pressure for use as a lightweight structural material. Similar to plywood, Duramold and other lightweight composite materials like the similar Haskelite were considered critical during periods of material shortage in World War II, replacing scarce materials such

form of engineered wood