Cardboard & Board Grades

Your cardboard packaging and POS material specification matter as this is one of the key elements for providing the support and durability that your product needs. Corrugated cardboard offers almost unlimited possible combinations of board types, flute sizes, paper weights and coatings that can be used depending on your requirements.

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Types of Paper, Paper Weights & GSM

Despite Kraft and Test liners being so popular, there are in fact a number of other options.

The available paper grades for outer and inner liners when manufacturing cardboard are as follows:

KRAFT (K): Virgin Kraft paper
TEST 2 (T2): Partly recycled liner paper
TEST 3 (T): Fully recycled liner
CHIP (C): Waste based liners
FULLY BLEACHED WHITE (BW): Fully bleached Kraft liner
WHITE TOP (WT): White coated recycled liner
MOTTLED KRAFT (MK): Mottled white Kraft
OYSTER (OY): Mottled test liner
SEMI CHEM (SC): Virgin fibres using neutral sulphite semi-chemical process
WASTE BASED (WB) 100% recycled fibres

Some of the most common paperweights that are used for corrugated material include:

125 GSM
150 GSM
200 GSM
300 GSM

Wall Types

Besides the varying paper weights and types, the type (and number) of fluting must also be considered.

At a basic level, a corrugated board is made up of the two liners, plus the single fluting. This is known as a ‘single wall’ board.
However, adding up an additional fluting section alongside an additional liner is known as ‘double wall’ or ‘double walled’ cardboard.
This effectively adds extra rigidity and strength, making it suitable for packing heavier products or adding additional protection for items that may more delicate or expensive.

Finally, if the items you are shipping are particularly heavy or large (for example automotive parts, industrial equipment etc.) then a ‘triple walled’ grade can also be used. As the name suggests, this adds another section of fluting and additional liner.Also referred to as Tri-Wall (which is the brand name of the manufacturers too), you can see a basic diagram of this below.

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