The Izod impact test is a method of determining the impact resistance or toughness of a material.
In other words, this test measures the total amount of energy a material is capable of absorbing.
ISO 180 defines the method used for pendulums to determine the impact resistance of a plastic sample under defined conditions. Different test parameters are specified in the standard depending on the type of material of which the sample is made and the type of notch made in it.