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ISO 180 specifies a method for determining the impact strength or impact resistance of a plastic specimen with an Izod test

Izod impact strength testing involves the use of a pendulum to break a test specimen being supported in a cantilever configuration. The impact energy absorbed in impacting a plastic specimen in an Izod test is taken as being equal to the difference between the potential energy of the pendulum and the energy remaining in the pendulum after impacting the plastic specimen.Specimens tested to determine the impact strength through the Izod impact resistance test and the practices of ISO 180 can be either unnotched or notched.

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