Edge Crush Test

Corrugated Boxes – Edge Crush Test (ECT)

There are at present two exams used all through the corrugated trade to find out energy. Traditionally, the very long time trade commonplace has been the Bursting (Mullen) Check, which is expounded to the tough dealing with sturdiness of corrugated materials. Bursting Check is a measure of the power required to rupture or puncture the face of corrugated board and is measured by a Mullen Tester. This power is not directly associated to a carton’s means to face up to exterior or inner forces and thus to comprise and shield a product throughout cargo. Bursting energy is reported in kilos (for instance, 275#).

A more recent commonplace that has achieved widespread acceptance is the Edge Crush Check (ECT). This can be a true efficiency take a look at and is immediately associated to the stacking energy of a carton. ECT is a measure of the edgewise compressive energy of corrugated board. It’s measured by compressing a small phase of board on edge between two inflexible platens or plates perpendicular to the path of the flutes till a peak load is established. That is measured in kilos per lineal inch of load bearing edge (lb/in), however often reported as an ECT worth (for instance, 44 ECT).

Edge Crush Test
Edge Crush Check


Right here it is very important level out that the equal ECT values are give at the least worth. It’s because corrugators could use one in all many alternative “recipes” to make every kind of corrugated. Every make-up will range barely in general energy. For instance differing formulation for a 200# single wall corrugated will trigger the equal ECT board to range between 32 ECT and 44 ECT. You will need to perceive what kind of corrugated you might be utilizing earlier than deciding to substitute any equal.

For instance, if you’re delivery a product that weights between 25-40 kilos, a 32 ECT single-wall carton ought to be ample, generally. In case your carton goes to be subjected to extreme dealing with, the 200# carton is perhaps a greater choice. It will be equal to a carton with an ECT of 32 or increased, and the bursting take a look at is extra of a real measure of tough dealing with.

The basic distinction between the 2 exams is that underneath the Burst Check a minimal board foundation weight is required. That’s, the Burst Check requires that the bottom papers used to make corrugated fiberboard weigh no less than a sure minimal variety of kilos per given unit space. The ECT eradicated this requirement, which permits the usage of lighter weight supplies whereas nonetheless offering excessive efficiency. When you’re evaluating two identically sized cartons with equal strengths, one being Burst Check rated and one being ECT rated, the ECT rated carton will weigh much less. In different phrases the ECT rated carton will use much less corrugated materials.

For instance examine a 275# single wall to an equal 44 ECT single wall corrugated board. On common, the 275# Burst Check rated single wall carton will weigh 175 kilos per 1000 sq. toes of fabric used. An equal 44 ECT rated single wall carton will weigh on common 149 kilos per 1000 sq. toes of fabric used. The 44 ECT board will cut back the fabric utilized by 14.8%.

Put otherwise, the correct ECT rated corrugated supplies an equal stage of energy, however makes use of much less materials. This interprets into fewer uncooked supplies, decrease power necessities, and lowered air pollution, in all phases of the bundle’s life cycle. Combining lighter supplies in a correctly sized carton with growing quantities of recycled content material means ECT rated corrugated reduces waste even additional.


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