ASTM D256-26 covers Test Methods A and C for determining the Izod pendulum impact resistance of plastics using notched specimens. It describes equipment, specimen preparation and notching, conditioning, testing procedures, calculations, and reporting requirements. Test Method C includes a procedure for estimating net impact resistance and is preferred for materials with an Izod impact resistance below 27 J/m.
The standard supports quality control and materials specification. Results depend on factors such as specimen preparation, notch quality, conditioning, specimen width, and test equipment; comparisons should account for these conditions.
Application Scope: Testing and evaluation of the impact resistance of plastic materials using Izod pendulum methods.
