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Below is a summary of the maximum suggest weight by measurement test (ECT and Mullen). See the detailed descriptions of the testing methodologies below. 

MULLEN TEST

The Burst (or Mullen) Test measures the force required to burst or rupture the face of a corrugated board. The Mullen Test suspends a piece of corrugated material and uses a machine to apply increasing levels of force to the face of the material until it bursts.

Burst Test results are given in pounds per square inch. A Mullen-tested box rated at 200# can withstand 200 pounds per square inch of force applied directly to the linerboard on the face of the carton.

EDGE CRUSH TEST

The Edge Crush Test, or ECT, looks specifically at how much force a corrugated material can withstand on its edges without crushing. Instead of applying force to the face of the corrugated material, as the Mullen Burst Test does, ECT applies force to the edge. The material is compressed top to bottom until it buckles.

Edge Crush Testing measures the force applied in pounds per linear inch of load-bearing edge and is reported as an ECT rating. 32 ECT is the most commonly used corrugated material.