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Corrugating medium is also unbleached and brown though the demands placed on it are quite different from the liner board. While liner board needs to be strong, the medium needs to easily conform without breaking. Medium is typically made from hardwood pulped in the neutral sulfite semi-chemical process or recycled fiber from old corrugated containers. These pulps both have shorter fibers and the paper produced from them is easily fluted on the corrugator. The medium is usually lighter and thinner than the liner board. It gives strength to corrugated board because of its curvature and shape, not its thickness.