ISO 5423 is a standard that specifies determining the resistance of rubber and plastics to flex cracking. You can apply it to both vulcanized and thermoplastic materials. Moreover, it is applicable to any material that can be formed into a sheet-like shape.

ISO 5423 test method involves subjecting a test specimen to continuous flexing at a specified frequency and bending angle until a crack or cut is observed. The test specimen is in the form of a V-shape, and the apex of the V is subjected to the flexing motion. The test is performed at room temperature and under controlled conditions to ensure reproducible results.

ISO 5423 specifies the number of test cycles, the bending angle, and the bending frequency required for the test and provides a rating system for evaluating the degree of cracking or cut growth.

NextGen’s Ross Flex Tester complies with ISO 5423 standard.

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