FLUTING/MEDIUM PAPER/TEST LINER is a type of kraft paper used in the production of corrugated cardboard. It’s called “fluting” because it has a wavy, flute-like structure that provides strength and rigidity to the cardboard. The fluting medium is typically made from a thin layer of paper that is creased and folded to create the wavy pattern. This unique structure allows the corrugated cardboard to absorb shocks and impacts, making it an excellent material for packaging and protecting items during shipping and storage.