NF EN ISO 8256, T51-111 (12/2023)

1.1 This document specifies two methods (Method A and Method B) for determining the tensile impact resistance of plastics under defined conditions. The tests can be described as tensile tests conducted at relatively high strain rates. These methods can be used with rigid materials (as defined in ISO 472), but are particularly useful for materials that are too flexible or too thin to be subjected to impact testing according to the ISO 179 series or ISO 180. 1.2 These methods are used to study the behavior of specified specimens, at defined impact velocities, and to evaluate the brittleness or toughness of specimens within the specific limits of the test conditions. 1.3 These methods are applicable both to test pieces prepared from casting materials and to test pieces taken from finished or semi-finished products (e.g. molded articles, laminates, extruded or cast sheets). 1.4 The results obtained by testing molded specimens of different dimensions may not necessarily be identical. Likewise, specimens cut from molded products may not give the same results as specimens of the same dimensions molded directly from the material. Test results from specimens made of molding mixtures cannot be directly applied to molded articles of any shape, because the values may depend on the shape of the molded article and the molding conditions. The results obtained by methods A and B may or may not be comparable. 1.5 These methods are not suitable for use as a data source for calculations made during part design. However, they make it possible to obtain information on the typical behavior of a material if various types of specimens prepared under different conditions are tested and if the tests are carried out at different temperatures. Both methods described are suitable for production controls and quality controls.
(Automatic translation from French)