The ASTM D6182-23 standard specifies a test method for leather surface coating flexibility and adhesion, which is applicable to finished leather. This method evaluates the cracking resistance, delamination resistance and discoloration resistance of coatings by simulating the performance changes of leather during repeated bending. The test uses the Bally flexibility tester, which conducts multiple bending cycles of leather samples under specific conditions, and then checks the integrity of the coating. This standard does not apply to blue wet leather, but is widely used in the quality control of leather products, providing a scientific basis for the performance evaluation of leather coatings.