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Each manufacturer will use a certified stamp to indicate the specifications of the box.  

It will inform you whether the box is single, double or triple wall strength.  

  • Single wall strength is one flute of corrugated material with a sheet of corrugated material adhered to both sides.
  • Double wall strength is two flutes of corrugate material with a sheet of corrugated material adhered to both sides and one in the center. 
  • Triple wall strength is three flutes of corrugated material with a sheet of corruaged material adhered to both sides and two in the center sandwiching the flutes.

The stamp will also indicate the Mullen Bursting Test - which is the pounds per square inch of force to burst the side of a corrugated box.  

Listed on the stamp will indicate the ECT (Edge Crush Test) - this indicates the stacking strength of the cardboard box. This is determined by the amount of force that is needed to crush the cardboard standing on its edge.

The name of the manufacturer should also be listed as part of the stamp. 

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