Knowledge About Flutes

The “Flute” describes the structure of the wave or arch shaped paper medium that makes up the board’s corrugation.

A-FLUTE

A-Flute is the highest flute size offering excellent cushioning and stacking qualities and short column crush resistance.
32 to 37 flutes/foot – approximately  ¼” thick when combined with inner and outer liner.

B-FLUTE

B-Flute has lower arch heights than A and more flutes per foot. This means that the medium contacts and supports the liners at a greater number of points, providing a stiff, flat surface for high quality printing and with excellent crush resistance.
45 to 52 flutes/foot – approximately 1/8" thick when combined with inner and outer liner.

C-FLUTE

C-Flute splits the difference between A and B Flutes. It’s thinner than A-flute, thicker than B, and offers good cushioning, stacking and printing properties. C-Flute is by far the most widely used flute size. An estimated 80% of today’s corrugated containers are made of C-Flute board.
39 to 43 flutes/foot – approximately 3/16" thick when combined with inner and outer liner.

E-FLUTE

E-Flute has a greater number of flutes per foot which gives it the greatest crush resistance and the flattest surface for high quality printing applications. The thin profile of E-Flute (one-quarter the thickness of A-Flute) reduces bulk and saves storage space.
92 to 98 Flutes/Foot – approximately 1/16" thick when combined with inner and outer liner.

F-FLUTE

F-Flute, the most recent, is a little more than half the thickness of E-Flute and is the newest growth segment in the corrugated industry. Developed in Europe, it reduces the total amount of fibre in the packaging and creates a more rigid box. 128 Flutes/Foot – approximately 1/32" thick when combined with inner and outer liner.