Compression Standard
Testing methodology provides a formal procedure for determining the edgewise compressive strength of paper and board using the ring crush method. Compliance with iso 12192 ensures that the results are comparable across different laboratories and manufacturing sites. The test involves placing a strip of the material into a circular groove and applying a vertical load until failure occurs.
Sample Preparation
Accuracy of the measurement depends on the precise cutting of the test specimen to ensure that the edges are perfectly parallel. Under iso 12192, the sample must be conditioned in a controlled environment to a specific temperature and humidity level before the test begins. Any moisture variation can significantly alter the compressive strength, as cellulose fibres soften in damp conditions.
The thickness of the material determines the size of the circular holder used in the apparatus.
Performance Metric
The value obtained from this test is used to predict the stacking strength of finished corrugated boxes. Because the ring crush test evaluates the material in its cross-machine direction, it provides data on how the fluting will behave under a vertical load. While newer methods like the short-span test are also used, iso 12192 remains a foundational reference for specifying the structural integrity of containerboard.
Manufacturers use these figures to guarantee that their packaging will not collapse during transport.
