As discussed in our previous article, there are three common corrugated testing methods: Burst Strength, Edge Crush, and Box Compression. We will be taking a closer look at each of these tests and explain exactly what each measures.
Burst Strength Test
This test is used to find out how much weight a box can carry as well as test rough handling. The Mullen Test, as it's commonly known as, tests the durability or toughness of the walls of the corrugated.
In this testing procedure, a rubber diaphragm is used to apply pressure to the walls of a corrugated box until it bursts. The diaphragm expands using hydraulics until it bursts under pressure.
Edge Crush Test
The Edge Crush tests the stacking strength of corrugated boxes and is also known as ECT. force is applied to one side of the box, perpendicular to the ridges or flutes until the box gets crushed. The diagram below shows the difference between ECT and the Mullen/Burst Strength.