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Flex testing is a mechanical durability assessment used to evaluate vulcanised or thermoplastic rubber’s resistance to crack initiation and cut growth under repeated flexural deformation. The sample is subjected to cyclic bending or flexing under controlled conditions, and the resulting crack formation or propagation is used to judge the material’s fatigue resistance and expected service performance. Common applications include tyre sidewalls, footwear soles, bellows, and any rubber component subject to repeated flexing in service.