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What is fluting? 

Fluting is the element of corrugated cardboard that contributes to material strength for stacking, resistance to crushing, or suitability for other uses, such as graphic reproduction. The types of fluting vary depending upon how many flutes are included per foot, and how thick the fluting is.

A-flute:

A-flute is the first type of corrugated cardboard invented. With 36-flutes/linear foot it is often used for wrap, cushioning or stacking.

B-flute:

Has 49-flutes/linear foot, and appears thinner than other types, but is strong, and is most often used for die-cut boxes, canned goods and displays.

C-flute:

With 41-flutes/linear foot, C-flute is thinner than A-flute, and thicker than B-flute, with flexibility in use. C-flute is the most common type of corrugated container material used, and is the typical corrugated cardboard found in regular slotted shipping cartons (RSCs).

E-flute:

Has 95-flutes/linear foot, and is one-fourth of the thickness of C-flute, E-flute is found in cosmetics boxes, glass and ceramic containers — and pizza boxes.

F-flute:

The newest type of corrugated cardboard; F-flute has 128 flutes/foot, is only half the thickness of E-flute, and is currently expanding in use because it can reduce the total amount of paper fiber in packaging for a more sustainable solution. Highly publicized adoptions of F-flute include McDonalds restaurant sandwich packaging, reducing total weight and paper use.