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ISO 12192 - Determination of compressive strength - Ring crush method

ISO 12192 standard describes a method for determining the edge compression resistance, also known as the ring crush resistance, of paper and cardboard, especially those used in the manufacturing of cardboard packaging.

This international standard applies to all papers and cardboards with a thickness ranging from 100 µm to 580 µm. However, it is important to note that for samples with a thickness less than 280 µm, the test values may result from a combination of buckling failure and pure compression. Conversely, for samples with a thickness greater than 580 µm, folding the test piece into a cylinder can induce stresses within the sample, which could potentially affect the test result.

The methodology prescribed by ISO 12192 involves using a cylindrical probe to compress a ring of paper or cardboard parallel to its plane. The apparatus used for this test includes a testing machine with a suitable compression resistance capacity, a cylindrical probe, and gauges for precise measurements. The procedure involves preparing the test samples, applying increasing force until failure, and calculating the ring crush resistance based on the maximum recorded force, basis weight, and dimensions of the test piece.

ISO 12192 provides a reliable and consistent method for evaluating the edge compression resistance of paper and cardboard products. It helps ensure product quality and improve their performance during transportation or storage by providing instructions on sample preparation, test conditions, and result calculations, thereby ensuring the accuracy and reproducibility of determining the ring crush resistance of a material.

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