ASTM D638

Test Materials: ASTM D638 specifies that the materials tested are primarily plastics, which may be in the form of films, sheets, or molded parts. The sample’s shape and size depend on the type of plastic being tested, with standardized dimensions provided in the standard.
Test Process: The test process involves gripping the plastic sample between two clamps and stretching it at a constant rate. The stress and strain are measured until the sample breaks or reaches a predetermined elongation. Data on force and elongation is recorded throughout the test.
Test Result Interpretation: Results from the ASTM D638 test include key tensile properties like tensile strength, elongation at break, and modulus of elasticity. These values help determine the plastic’s performance under stress and its suitability for various applications.