What is ECT?

The Edge Crush Test (ECT) is a laboratory test method used to measure the cross direction crushing of a sample of corrugated board. It provides information on the ability  of a particular board construction to resist crushing. ECT is a measure of the edgewise  compressive strength of corrugated board. 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) The Bursting (Mullen) Test is another test used throughout the corrugated industry to  determine strength. It is related to the rough handling durability of corrugated material. 200 Lbs, 275 Lbs (Lbs = Pounds). 

It is important to understand what type of corrugated you are using before deciding to  substitute any equivalent. For example, if you are shipping an item the 200# carton might  be a better option. If you aretransporting or moving you can use a 32# ECT box