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ISO 179-Charpy Impact Strength of Notched Plastics Testing Equipment

This test standard is to determine the impact strength or impact resistance of a plastic specimen with the Charpy test method.
Charpy 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 a Charpy 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. Corrections accounting for friction and air-resistance losses must also be made to determine the true impact resistance of the plastic.

Specimens tested to determine the impact strength through the Charpy impact resistance test and the practices of ISO 179 must be notched. Charpy impact testing of notched specimens in accordance to ISO 179 is a common test to determine notch sensitivity of a plastic material. Test machines that are used to perform Charpy impact strength tests in accordance to ISO 179 must meet the requirements of ISO 13802; verification of Charpy pendulum impact testing machines.
ISO 179 is suitable for use with the following range of materials: rigid thermoplastic moulding and extrusion materials (including filled and reinforced compounds in addition to unfilled types) and rigid thermoplastics sheets; rigid thermosetting moulding materials (including filled and reinforced compounds) and rigid thermosetting sheets (including laminates); fibre-reinforced thermosetting and thermoplastic composites incorporating unidirectional or multi-directional reinforcements (such as mats, woven fabrics, woven rovings, chopped strands, combination and hybrid reinforcements, rovings and milled fibres) or incorporating sheets made from pre-impregnated materials (prepregs), including filled compounds; thermotropic liquid-crystal polymers.
ISO 179 and ISO 180 appear to be very similar test methods for determining the impact strength of plastics, however the testing methods are very different and should not be considered interchangeable.

Equipment Required:

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