1.1 This standard specifies a method for determining the Izod impact resistance of rigid plastics. Different test conditions are specified depending on the type of specimen and the type of notch (see 6.1, table 3 and figures 2 and 3). 1.2 This method is used to study the behavior of defined specimens, subjected to determined impact stresses and to estimate the fragility or toughness of the specimens within the limits inherent to the test conditions. 1.3 It applies, inter alia, to the following materials:
——rigid thermoplastics for molding or extrusion, including filled and reinforced composites and rigid thermoplastic sheets;
——thermosetting molding materials, including filled and reinforced composites;
——sheets of thermosetting materials including laminated ones;
——fiber-reinforced composite materials in the form of felt, fabric, woven roving, staple fibers, cut roving, including prepregs. — composite materials reinforced by unidirectional fibers, including prepregs. NOTE — The use of notched specimens is not appropriate for certain reinforced plastics. This test cannot be applied to cellular materials. 1.4 This method applies to specimens prepared from injection molding materials or taken from finished or semi-finished products (for example, molded parts, laminates and extruded or cast sheets). The method is applicable for production control as well as for the acceptance or rejection of materials in accordance with the specifications of molding materials and finished products. 1.5 The results obtained when testing specimens of different sizes as well as those obtained from molded products are not necessarily the same. 1.6 This method should not be used as a data source to calculate the elements of a project. However, information about the typical behavior of a material can be obtained by testing different types of specimens prepared under different conditions, varying the notch radius and temperatures.