This standard specifies a test method for determining the impact resistance of plastic films by means of a freely falling pendulum impact. The core principle involves using a pendulum of a specified mass (e.g., 1.5 kg or 2 kg) released from a set height to impact a vertically fixed specimen, and recording the energy loss to determine the impact energy required to break the specimen. The key instrument for implementing this method is the pendulum impact tester, which includes a precise system for calibrating and measuring impact energy. The standard details the instrument specifications, specimen requirements, test procedures, and methods for calculating results. It is applicable for evaluating the impact resistance of various plastic films (particularly thinner films) as well as flexible packaging materials such as aluminum foil and paper.