Do I want 200 lbs or ECT 32?


The Burst Test (aka Mullen Test) is the force of pounds per square inch required to rupture or burst the side of a cardboard box. This method indicates the box's ability to withstand external or internal forces and how the box will contain its contents during rough handling. For example, a box with a burst strength of 200 lbs per sq. inch indicates that the corrugated used to make the box can withstand 200 lbs of pressure per square inch.

- The Burst Test = containment and handling ability of a box.


Edge Crush Test (ECT) measures the stacking strength of corrugated boxes or fiberboard. Determining a finished box's compression strength is defined by the amount of force that is needed to crush corrugated by standing it on its edge. This test is also measured in lbs per square inch. For example, a box with an ect 32 lbs per square inch indicates that the board, standing on edge, can withstand a force of 32 lbs per square inch before crushing. Think about the movement of your boxes during transportation. At some point during a move it is likely your boxes will be stacked on a pallet, in a container or in the back of a truck. Yes, stacking is the key concept behind ect. Know the strength of your corrugated cardboard boxes before stacking.

-ECT = distribution & transportation of boxes and their stacking strength.


NOTE: Mullen Test is comprised of VIRGIN Kraft material.  Edge Crush board has a certain % of recycled content that makes up the corrugated carton, which gives it a competative edge.  However, it really comes down to your product and how its being shipped and how much protection you are looking for.


Factors to consider:

  • Nature of the product being packaged
  • Total weight and size of the box
  • How the dimensions relate to each other
    (i.e. large depth relative to the length and width of the box)
  • How the corrugated cardboard boxes will be stacked, stored and transported.


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