ASTM D 256 is a standard test method established by ASTM International for determining the impact resistance of plastics using the Izod impact test. This test method is widely used to assess the toughness of plastic materials by measuring the energy required to break a notched specimen under specific conditions. The resulting values offer valuable insights into the material's ability to withstand sudden impacts, which is critical in applications where sudden loads or shocks are possible. The test can be performed on various forms of plastics, including rigid thermoplastics and thermosetting materials, and is essential for material selection, quality control, and research and development within the plastics industry.
ASTM D 256 specifies detailed procedures for preparing samples, including size, shape, and notch dimensions, as well as test conditions such as temperature and humidity. The test involves securing a notched specimen vertically in a test fixture and striking it with a pendulum. The amount of energy absorbed by the specimen in breaking is recorded, providing a quantitative measure of impact resistance, usually expressed in joules per meter (J/m) or foot-pounds per inch (ft-lb/in). Variations in test parameters or specimen shape can affect results, so strict adherence to the standard is necessary for reliable data. Understanding and applying the results of the ASTM D 256 test enables manufacturers, researchers, and quality assurance professionals to evaluate material suitability for specific applications and ensure compliance with industry requirements.
We are at your disposal for any questions, comments and suggestions. We look forward to hearing from you.
Feel free to contact us using the contact form below.
We strive to answer all inquiries within 24 hours (on working days).
