Choosing the Right Corrugated Cardboard Flute Thickness

Corrugated Cardboard Flute Thickness

If you’re planning on buying corrugated cardboard, it’s important to know the type of fluting. This will help you select the right material to meet your needs and ensure that your packaging is both strong and high quality.

For example, C flute has great compression strength but is prone to crushing if it’s overloaded. A better option is EB, a double-walled material that combines both B and E flutes.


Corrugated fiberboard (often referred to as cardboard) is made from two linerboards sandwiching a middle sheet of wavy material known as fluting. The flutes make the box strong, and also serve as an insulator and cushion. Fluting comes in a variety of heights, which determine the type of shipping strength the box can offer and how easily it can be printed.

The most popular flute size is C, which has 39-43 flutes per foot and is about.1875 inches in height. It offers excellent crush resistance and stacking strength for lightweight products, and its flat surface makes it ideal for printing and die cutting.

The B flute has 47-48 flutes per foot and is about.125 inches in height. It has a lower height than the A flute and is ideal for e-commerce packaging, due to its superior printability and stacking strength. It has good crush and puncture resistance, but is not ideal for shipping rigid or large items.


Corrugated cardboard has a series of flutes within it, which offer cushioning protection and stacking strength. These flutes vary in height and spacing, making them suitable for different types of products and boxes. A very fine material flute denoted as E offers light packaging, while a coarser flute is good for heavier products like furniture and glassware.

The flexographic or lithographic printing process used to print on the flutes of corrugated cardboard creates beautiful graphics and messages for your business. These boxes are a perfect way to promote your brand and make it look professional. They can also be made into a one-piece folder box, making them easy to open and assemble.

The B flute is commonly used for POP displays and folding inserts. It has decent stacking strength, excellent crush resistance and good printability. Its flutes are slightly wider and closer together than C and E flutes, making it ideal for smaller products. This combination of stability and printability makes it an excellent choice for e-commerce mailers and other double wall corrugated products.


Flute thickness is an important factor when selecting a flute profile for your custom packaging. The size of the flutes directly impacts the compressive and cushioning strengths of the box, as well as its take up capabilities. The various profiles offer different advantages, but each has its own unique benefits.

The E flute has a very thin board profile, which helps reduce outer box dimensions and storage costs. This flute type also offers excellent crush resistance and a flat surface that allows for high-quality printing. This flute is commonly used for consumer products packaging.

The B flute has a thicker board than C, and it provides superb crush resistance. It also has a good print surface and is ideal for partitions inside custom boxes. This type of flute is often used for transporting glass, cans, and furniture items. It can also be combined with the E flute to create a double-wall material, which offers better protection and a superior printing surface.


This double-wall fluting material is a good choice for box designs that require extra protection during shipping. Its thickness offers good crush resistance and provides a strong, flat surface that’s ideal for printing high-quality images and texts. It’s also less expensive than A-flute and a great choice for bulk orders.

Developed for packaging canned goods, B flute is also popular as a counter display box. It is crust-resistant, and its thin construction reduces outer box dimensions and saves storage space. It’s also a good option for inner packaging such as pads or dividers, and it prints well.

Flutes are the wave-like lines adhered to layers of linerboard that give corrugated cardboard strength and structure. They’re available in different sizes, known as flute profiles, ranging from A-flute (the largest) to F-flute and below (microflutes). Each profile has its own advantages, depending on the weight and fragility of the product being packaged. Larger flute profiles provide greater vertical compression strength, while smaller ones offer superior printability.

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