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Corrugated 101

Two tests measure the strength of a corrugated board: the bursting test and the edge-crush test. The bursting test evaluates the bursting strength of a board. Bursting strength is the force required to break through the board and indicates the box’s ability to withstand both internal and external pressure. Similarly, the edge-crush test evaluates the edge-crush strength of the board. Edge-crush strength is the amount of force required to crush the board’s edge and predicts the overall compression strength of the finished box.

Start with the weight of your contents to determine the strength of corrugated material you require, as indicated in the chart below:

Singlewall Corrugated Boxes:

 

Maximum weight of box and contents (lbs.) Minimum bursting test singlewall, doublewall
Minimum edge crush
20 125 23
35 150 26
50 175 29
65 200 32
80 250 40
95 275 44
120 350 55

Doublewall Corrugated Boxes:

 

 Maximum weight of box and contents (lbs.)  Minimum bursting test singlewall, doublewall Minimum edge crush
 80  200  42
 100  275  48
 120  350  51
 140  400  61
 160  500  71
 180  600  82