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Corrugated Boxes â Edge Crush Test (ECT) There are currently two tests used throughout the corrugated industry to determine strength. Historically, the long time industry standard has been the Bursting (Mullen) Test, which is related to the rough handling durability of corrugated material.
ECT has a checkered past. When ECT was first introduced in the 1930s, it was known as âelectroshock therapy.â In its early use, patients regularly suffered broken bones and related injuries during therapy. Muscle relaxants werenât available to control the violent convulsions caused by ECT.