Warehouse Boxes Brisbane

Cardboard Boxes – Industrial Strength

Qld Boxes specialise in heavy duty industrial type strength cardboard boxes. Corrugated cardboard is a stiff, strong, and light-weight material made up of three layers of brown kraft paper

Cardboard commonly comes in different strengths. Cardboard strength is measured by the manufacturer using;

  1. Glue Tests
  2. Bursting Tests
  3. Compression Tests

Based on these measurements the cardboard is assigned different grades depending on the score it receives.

A common global strength indicator looks like this:


  • The first number is the weight that the cardboard can withstand before it is crushed.
  • The letter stands for the kind of corrugation between the two layers of cardboard.
    • Common letters include E, less than 1/10-inch thick; B, less than 1/8 inch; C, about 1/6th inch; and BC, about 1/5 inch thick.
  • The last number stands for how much weight the second layer of cardboard can hold in kilograms
  • The final letter stands for the kind of paper used. K stands for kraft, one of the most commonly used types of paper.


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