What is Corrugated?

Corrugated is easy to recognize. Corrugated is made of paper and has an arched layer, called "fluting," between smooth sheets, called "liner." This arched layer provides corrugated with a very high strength-to-weight ratio. The corrugated most commonly used to make boxes has one layer of fluting between two smooth sheets. But there are many types of corrugated available, each with different flute sizes and thicknesses. Corrugated is an extremely durable, versatile, economical and lightweight material used for custom-manufactured shipping containers, packaging and point-of-purchase displays, in addition to numerous non-traditional applications ranging from pallets to children's toys to furniture.


Types of Corrugated

Corrugated fiberboard, or combined board, has two main components: the linerboard and the medium. Both are made of a special kind of heavy paper called containerboard. Linerboard is the flat facing that adheres to the medium. The medium is the wavy, fluted paper in between the liners.

Corrugated board is generally made in four flute sizes A, C, B, and E. The "Flute" describes the structure of the wave-shaped cardboard material that makes up a board's corrugation.

Flute Nominal Thickness Comments  
A 4.7 mm excellent stacking strength
C 3.6 mm good stacking strength good crush resistance very common material
B 2.5 mm good puncture resistance less space consumed in warehouse uses: canned goods, displays
E 1.1 mm light weight strong alternative to paperboard superior printing surface excellent for custom die cut boxes uses: displays, point of purchase boxes


Corrugated Recycles.

When you see any of the following three symbols on a corrugated container, you know it can be recycled.