ISO 22088-3 Plastics - Determination of Resistance to Environmental Stress Cracking (ESC) - Part 3: Twisted Strip Method

Environmental Tests

ISO 22088-3 Plastics - Determination of Resistance to Environmental Stress Cracking (ESC) - Part 3: Twisted Strip Method

EUROLAB laboratory provides testing and compliance services within the scope of ISO 22088-3 standard. This part of the ISO 22088 standard, developed by the International Standards Organization (ISO), specifies a method for determining the environmental stress cracking (ESC) resistance of thermoplastics when subjected to a constant bending stress in the presence of chemicals.

ISO 22088-3 Plastics - Determination of Resistance to Environmental Stress Cracking (ESC) - Part 3: Twisted Strip Method

ESC is indicated by the change of an appropriately selected indicator property of samples that have been stretched in the medium for a specified period of time. The test method is suitable for determining the resistance of plates and flat test specimens, especially the sensitivity of localized surface regions of specimens to ESC. This is primarily a ranking test and is not intended to provide data to be used for design or performance prediction.

To determine the indicator property, a test specimen suitable for one of its faces is clamped on a fixed radius and brought into contact with the test medium. Due to the influence of the environment in the presence of stress, cracks may occur over time, which sometimes turn into visible cracks. Using a series of forms with decreasing radius, a series of test specimens with increasing strains on the outer surface can be tested.

After an agreed time of contact with the test medium, the test specimens are visually observed, not clamped and evaluated by mechanical or other testing. The fracture strain corresponding to the failure criterion is obtained directly with values ​​or graphically. The maximum strain should be less than the strain at yield.

The failure criterion is also commonly expressed in terms of the ESC index. Failure strains may be different for different indicator traits.

The shape and dimensions of the test specimens shall be in accordance with the relevant material standard. When there is no material standard, the shape and dimensions shall conform to the test method standard. If test specimens are processed from plates or articles, their thickness should be the thickness of the plate or article. This will be reported along with the original location of the sample on the page or article.

To obtain comparable results, test specimens used must have the same dimensions, condition, preparation mode and age. When cut or machined from sheet metal or articles, it will be cut from relevant places and in appropriate directions. The cut edges will have a clean surface. The molding or processing conditions used for sample preparation should be reported.

Among the services provided by our organization within the framework of material testing services, there are also ISO 22088-3 standard tests. Do not hesitate to contact our laboratory EUROLAB for your testing and certification requests.

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