BS ISO 7765-2:2025

Plastics film and sheeting. Determination of impact resistance by the free-falling dart method. Instrumented puncture test | Status: Current

1 Scope This document specifies a test method for the determination of puncture impact properties of a plastic film using instruments for measuring force and deflection. It is applicable if a force-deflection or force-time diagram, recorded at nominally constant striker velocity, is required for detailed characterization of the impact behaviour. This test method is also used when a small number of test specimens are available, and the staircase method described in the ISO 7765‑1 cannot be applied. The test method is applicable to films of up to 1 mm thickness and makes it possible to compare impact-penetration forces, biaxial deformabilities and energy-absorption capacities of films. Also, the transition region between brittle and tough behaviour of the film under the conditions of testing can be determined by varying the temperature or the penetration velocity or the relative humidity.[4]