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Edge Crush Test (ECT)

The Edge Crush Test (ECT) is a standard industry measure of the stacking strength of corrugated board. The amount of force needed to crush on-edge combined board is a primary factor in predicting the compressive strength of the completed box.

It is measured by compressing a small segment of board on edge between two rigid platens or plates perpendicular to the direction of the flutes until a peak load is established. This is measured in pounds per lineal inch of load bearing edge (lb/in), but usually reported as an ECT value (for example, 44 ECT).

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