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;
- Glue Tests
- Bursting Tests
- 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.