This standard specifies a method for determining the impact strength of plastics under standard conditions using the cantilever beam (Izod) test. It is used to study and evaluate the impact behavior of specified types of test specimens to determine their brittleness or toughness under test conditions. The standard applies to rigid thermoplastic, thermosetting materials, and their composites. The method typically employs a pendulum-type cantilever beam impact testing machine, which has sufficient rigidity and a stable structure. The impact strength is calculated by measuring the energy consumed by the pendulum to break a notched specimen held vertically, providing a standardized test basis for evaluating the impact resistance of materials.