Testliner paper is a recycled base liner board for container boards. It is produced from 100% recycled fibers. The products consist of three layers, and Testliner is used for the inner and outer layers of carton boxes. Testliner is divided into three categories based on the quality, with those categories being LH, LE, and LF. The usage of coloring agents gives Testliner paper a stable optical color, and the presence of starch ensures the strength of it. Lastly synthetic adhesives are added to optimize the printability of the paper.