The ISO 16770 standard defines stress cracking resistance of polyethylene (PE) materials as the time until failure of a specimen that has been notched and is held in tension in a chemical bath. The specimens are cut from compression-moulded sheet or finished product. Environments such as a surfactant solution at a specific temperature can have a significant effect on the life of a cracked specimen.
ISO 16770 was written for testing polyethylene materials but can be used to evaluate PE extrusions such as PE fusion welds/fittings, pipe segments, and blow-moulded PE containers to study the effect of aggressive environments for example dangerous goods/chemicals. The method may also be adapted for other thermoplastic materials, including polypropylene (PP), however care must be taken in interpreting the results as the processing stresses/orientation in finished products may affect time to failure.
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