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Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics.
These test methods cover the determination of the resistance of plastics to “standardized” pendulum-type hammers, mounted in “standardized” machines, in breaking standard specimens with one pendulum swing. The standard tests for these test methods require specimens made with a milled notch.
In Test Methods A, C, and D, the notch produces a stress concentration that increases the probability of a brittle, rather than a ductile, fracture.
In Test Method E, the impact resistance is obtained by reversing the notched specimen 180° in the clamping vise. The results of all test methods are reported in terms of energy absorbed per unit of specimen width or per unit of the cross-sectional area under the notch.