GB/T 9639.1

Test Materials: In GB/T 9639.1, the test material is plastic film or sheeting, typically made from various polymers such as polyethylene, polypropylene, or PVC. The material should be free of defects and prepared according to specific dimensions (typically 300mm x 300mm) for testing.
Test Process: The Free Falling Dart Method involves dropping a dart of specified weight and size from a designated height onto the plastic film. The impact force causes the film to either rupture or remain intact, depending on the material’s resistance. The test setup must ensure consistent environmental conditions and precise measurement of height.
Test Result Interpretation: Results are interpreted based on the film’s ability to resist impact. The impact resistance is quantified by the weight and height at which the dart causes the film to rupture. A higher impact resistance indicates better performance of the plastic film. The test value is usually reported as the height or energy required to rupture the film.