The break resistance and break resistance index of paperboard are commonly used indexes to evaluate the strength and durability of paperboard.

Bursting Strength: Bursting strength is a measure of the cardboard’s ability to resist bursting from internal pressures and external forces. It refers to the maximum pressure value that the cardboard can withstand under gradually increasing pressure. Rupture resistance is usually expressed in terms of pressure per unit area, such as kilopascal (kPa) or pound force per square inch (psi).

Bursting Strength Index (Bursting Strength Index) : The bursting index is the ratio between the bursting strength and the base weight of the cardboard. It indicates the breaking resistance of the cardboard under the unit weight. The formula for calculating the break resistance index is: Break resistance index = break resistance/base weight. Usually expressed in kilopascal/gram (kPa/g) or pound force/pound (psi/lb).

Cardboard break resistance and break index

The break resistance and the break index are usually measured using a break resistance tester, which applies pressure by gradually increasing the internal air pressure until the cardboard cracks. In this way, the break resistance of the cardboard can be determined and the break resistance index can be calculated.

The break resistance and the break index are very important for the quality control and evaluation of paperboard. Higher break resistance and break index means that the cardboard has better strength and durability, which can provide better performance when transporting, packaging and protecting the product. These indicators are widely used in the cardboard manufacturing and packaging industry to ensure that the quality of cardboard meets the requirements and meets the needs of specific applications.