GB/T 1732-2020 "Determination of impact resistance of paint films" is applicable to the determination of the impact resistance of paint films. It involves a fixed mass (1000±1 g) hammer falling onto a punch to impact the cured paint film on a metal substrate. The test can be performed using either forward or reverse impact methods, with the height of the hammer drop gradually increased until the maximum height that does not cause damage to the paint film is identified. The maximum scale of the impact tester guide tube is 50.0±0.1 cm. The standard specifies the dimensions of the test panels, the spacing between impact points, and the lighting conditions for observation, providing a standardized method for evaluating the impact resistance of paint films.