ISO 8256 determines the stress cracking resistance of polyethylene materials. The test is carried out on notched test specimens cut from compression-moulded sheet or finished products, as applicable. The test specimen is subjected to a static tensile load when immersed in an environment such as a surfactant solution held at a specified temperature, and the time to failure measured. The energy utilized in the test method of ISO 8256 is delivered by a single swing of the pendulum of a tensile-impact machine.

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