Fluting or Medium represents paper used to make the wavy sheet inside the cardboard. This type of paper is key for making a strong corrugated board since its characteristics affect the strength of a box.
Key indicators of Fluting quality are its CMT and SCT values.
Nowadays, the most common weights for Fluting are:
90 gr/m², 100 gr/m², 120 gr/m², 150 gr/m² and 175 gr/m²