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Corrugated Flutes are the S shaped waves/arches of a corrugated box that makes up the board. This is called the boards corrugation. Flutes are essentially the reinforcement that make up the board. They run parallel to the depth of the container and give it its rigidity and crushing/stacking strength. As well as providing stacking strength, flutes also provide insulation that protects products from sudden temperature changes. Generally speaking, larger flutes like A & B profile provide greater strength and cushioning, while smaller flute profiles like D & E provide better printability and foldability.

B flutes have 42-50 flutes per foot and are 1/8″ thick.
They provide the second highest arch size. B flutes provide good stacking strength and crushing resistance. Ideally used for canned goods and displays.

C flutes have 39-43 flutes per foot and are 11/64″ thick.
They are the medium between A flute and B flute and are very common. C flutes provide good cushioning, stacking and printing properties. Ideally used for glass, furniture and dairy.

E flutes have 94 flutes per foot and are 1/16″ thick.
The board profile is super-thin which in turn reduces box size and saves store space. E flutes provide the greatest crush resistance and a super printing surface which make it an excellent choice for die-cut custom boxes.