Closeup view of roll of brown corrugated cardboard, space for text. Recyclable material

What is Corrugated Cardboard?

Most people know what cardboard is, but did you know it comes in many different types and forms? You may have seen the term corrugated cardboard online, in one of our previous articles or when ordering boxes online. But what exactly is corrugated cardboard, and why is it Jetbox’s cardboard of choice?

How is Corrugated Cardboard Made?

The journey for corrugated cardboard begins in the paper mill. Rolls of paper are made and then sent to a corrugating, or converting, plant. This paper is then crimped, layered and glued together to form corrugated cardboard. Once the cardboard has been made, it is cut, printed and folded to suit the needs of the business purchasing it. Corrugated cardboard is used for things such as displays, shipping boxes and moving boxes.

What does the inside of Corrugated Cardboard Look Like?

Corrugated cardboard is made up of three different layers, like a cardboard sandwich. The two outer layers are referred to as the inside liner and outside liner, with the middle layer a ruffled cardboard known as the fluting medium. The benefits of a cardboard made with layers like this are many, and include:

  • Durability
  • Product Protection
  • Lightweight
  • High strength to weight ratio
  • Budget friendly
  • Environmentally friendly
What Are the Different Types of Corrugated Cardboard?

When it comes to customising corrugated cardboard for your needs, there are a number of ways we can do this! From different wall types, to appearance and flute types, corrugated cardboard is made to suit you. No matter how you customise it, the benefits of corrugated cardboard remain the same, so no need to worry!

Different Wall Types for Corrugated Cardboard

As described above, the most common way to make corrugated cardboard is with a single piece of fluted material between two pieces of liner. This is known as a single wall. However, corrugated cardboard also comes in double and triple wall board.

Double wall, also known as twin cushion, has two pieces of fluted material, with three pieces of liner. The order is the same, liner – flute – liner with an additional flute and liner on top. This type of board is resistant to breaking when stacked and is commonly used in industrial settings. At Jetbox, we offer a number of different twin cushion cardboard options, as well as single and triple. Check out our website to see our range of approximately 80 cardboard grades!

Triple wall is three pieces of fluted material between four pieces of liner. Triple wall corrugated cardboard is so sturdy that it acts as a substitute for wooden shipping crates.

Appearance Options for Corrugated Cardboard

The look of your cardboard is dependent on the materials you choose to use. Recycled paper has a different look to kraft paper, for example, where the board is made using different products. Kraft board itself can come in brown or white. If you are looking for a certain colour, be sure to get in contact with your cardboard box supplier!

Different Flute Types for Corrugated Cardboard

For those just beginning their corrugated journey, it can be easy to assume that the thicker the cardboard, the stronger the box. This is, however, a common misconception. The type of flute plays a major role in the strength and purpose of a box, and you cannot always tell how well a box will hold up on its thickness alone. It is also important to note that the cardboard alone shouldn’t be your only form of protection, with things such as inserts and sleeves an important part of your packaging.

E Flute

Ideal for die-cut custom boxes thanks to its excellent printing surface. Has the greatest crush resistance.

B Flute

Used commonly for canned goods and displays. Also has good crushing resistance and stacking strength.


C Flute

Ideal for holding and transporting glass, furniture and dairy. Provides good cushioning, stacking and printing properties.

A Flute

The highest quality cushioning for transporting both fragile or heavy products. Is exceptionally stiff, and is chosen for a number of export uses.

Australian Made Corrugated Cardboard with Jetbox

At Jetbox, we create custom-made boxes for all your business needs! Our wide range of corrugated cardboard allows you to choose the perfect flute, colour and cushioning. We also sell packaging inserts, to help you ship your items with confidence. Visit our website today, and check out our online resources such as our custom box calculator!

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Bulky Item Delivery Terms & Conditions

Some of our products are large, heavy and bulky and require extra care or special shipping. If your order requires a forklift we will advise before delivery, and if no forklift is available upon delivery a surcharge will apply.

Bulky deliveries that require hand delivery (but no forklift) to the first floor or above and require stair or lift access will also be subject to a delivery surcharge. If you advise at checkout that your delivery is above the ground floor, we will be in touch regarding the surcharge. This surcharge is from $50 per pallet.

Over & Under Runs

Manufacturing processes require machinery to work at quite high speeds. During production, some sheets may be damaged and need to be replaced. In some instances, we cannot replace the sheets at that time and you will be met with a slightly lower Quantity than ordered. This amount will be credited to you.

In most cases though, there will be overruns, as the machinery cannot come to a complete stop in an instant – we require a gradual slow down, which will give us more cartons produced, than what are ordered. These overruns are payable by the client. And taking them also helps save on recycling, which is more sustainable and better for the Environment in the long term.

If you require EXACT Quantities, we may have to make some boxes in a different grade than ordered, to make up your order in the Exact Qty required. These requests will also Incur higher unit costs. This cannot be avoided, as we must consider the recycling processes and costs involved, in helping to reduce our carbon footprint.

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BOARD GRADES

5C or B – Light single flute cardboard used for light packaging requirements or for products that support themselves.

4C or B – Slightly stronger single flute cardboard used for packing paper/notes/pads, etc. Usually for products that self support.

3C or B – Most common board grade usually used for virtually any standard light weight packing.

3C or B Super – Medium strength board that is slightly stronger than the above 3C/B board and can also be used for frozen goods.

1C or B – Strong single flute carboard used mainly for products that need extra support when stacking.

1C or B Super – Super Strength Cardboard that is mainly used for frozen food products that are transported long distance.

3 BC – Twin Cushion cardboard used for Removal Boxes and products that need that little extra care when packaged or for bulky items that may need thicker board when transported.

1 BC – Twin Cushion cardboard with some of the highest grade board for Superior support and stack-ability. Primarily for items over 30KG.