sharpy & izod impact tester

The impact resistance test determines the amount of energy absorbed by a material during fracture. This absorbed energy is a measure of a given material’s notch toughness and acts as a tool to study temperature-dependent ductile-brittle transition.

In case of Charpy or Izod, the impact is induced by a pendulum hammer on the sample. The residual energy of the hammer is measured.

Testing procedure

The impact test is performed on a standardized sample of 80 x 10 x 4 mm, with or without notch. The sample is placed in a frame and the pendulum is released.

Difference between the Sharpy and Izod impact test

Difference between the Charpy and the Izod impact tests

Testing applications

  • Quality control
  • Determination of the impact resistance of plastics


ISO 179-1:2010 -- Plastics -- Determination of Charpy impact properties -- Part 1: Non-instrumented impact test

ISO 180:2000 -- Plastics -- Determination of Izod impact strength