Linerboard is a general term for describing heavyweight grades of paper used primarily in the construction of corrugated containers. Linerboard is used as flat facing material on the inner and outer portions of a corrugated medium (fluting) which are combined to a rigid board commonly called containerboard.
Test liner / Recycled linerboard: exceeds 20 % recycled fiber composition and is used as a raw material in the production of corrugated cardboard, it is used for manufacturing internal and external layers of corrugated cardboard, between which there is a shock-absorbing fluted medium made of fluting.
White top linerboard / Kraft linerboard: it is classified as being made with no less than 80 % virgin pulp. This high grammage, high strength kraft is used to produce boxes particularly in the food industry where boxes are kept in moist conditions.