How to know the required resistance of your cardboard box

Each product requires a unique packaging solution, since the dimensions, weight, fragility, material, etc. change. Sometimes it happens that, by not choosing the correct corrugated cardboard packaging correctly, the product is damaged.

That is why the resistance of the cardboard packaging must be calculated, thus, ensuring the well-being of what it will contain. The resistance in a cardboard packaging is the strength it has when exposed to a force that is applied on its surface.

The level of resistance is measured depends on the loss of strength that occurs, this loss, is exerted when handling the packaging, whether in palletizing, transport, storage, etc.

This is why it is important to know the required resistance. To find out, there are different tests that can help us, this are some of them.


ECT (Edge Crush Test).


Measures the maximum compressive force that a cardboard sample can withstand. This test is used to determine the strength of corrugated packaging.

The strength is directly related to the compressive strength of the corrugated sheet (medium) and the flat sheets (liners) that go to the sides of the medium.

Mullen test

The Mullen test is used to measure the bursting or puncture resistance of corrugated packaging.

The compact paper (linerboard) provides the force against the bursting or perforation of a corrugated cardboard sheet. The weight of paper is expressed in pounds per 1,000 square feet (lbs / 1000 sq. Ft.) And directly determines the strength of the paper.


The following table shows the approximate equivalence between the ECT and Mullen resistances (not all resistances are equivalent)

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