Linerboard is thick, rigid paper that is used to form the external faces of corrugated products and provide resistance to vertical loads.
Linerboard is offered in two lines:
Kraft linerboard (virgin fibre)
Natural brown or recycled white linerboard (recycled fibre)
As with the corrugating medium, linerboard qualities may vary depending on the desired use. These papers are also available in a range of thicknesses categorized by basis weights. The type of linerboard is chosen in accordance with the desired surface smoothness or final degree of rigidity.