ASTM D256 is a standard published by ASTM (the American Society for Testing and Materials) titled “Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics.” This standard serves as a comprehensive guide for performing the Izod impact test, which is widely used to assess plastic impact resistance.

In the Izod impact test, a notched plastic specimen is subjected to a swinging pendulum hammer, and the energy absorbed during fracture is measured. This test helps evaluate the material’s ability to withstand sudden impact loads and provides essential insights into its toughness and resistance to brittle fracture.

ASTM D256 establishes standardized procedures for preparing test specimens, defining test conditions, and accurately calculating and reporting test results. By adhering to this standard, consistent and reliable testing can be achieved across different laboratories, facilitating meaningful comparisons among various plastic materials.

Class J – Charpy and Izod Automatic Impact Testing System complies with ASTM D256 standard.

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