ISO 6252 Plastics - Determination of Environmental Stress Cracking (ESC) - Standard Test for Constant Tensile Stress Method

EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of ISO 6252 testing. This standard specifies methods for the determination of environmental stress cracking (ESC) of plastics subjected to a constant tensile force in the presence of chemicals.

The test can be applied to test specimens prepared by molding or machining and can be used both for the assessment of environmental stress cracking of a plastic product or material exposed to different environments, and to determine the ESC of different exposed plastic materials.

Environmental stress cracking is exhibited by many materials, including plastics. When a plastic material is stretched or stretched in air below its yield point, stress cracking can occur after what can be a very long time. These voltages can be internal or external, or a combination of both. Simultaneous exposure to a chemical environment with the same stress or strain can result in significantly shorter downtime.

The cracks produced can penetrate completely through the thickness of the material, split it into two or more pieces, or be stopped when they reach regions of lower stress or different material morphology.

When a test specimen is immersed in a given liquid at the temperature selected for testing, it is subjected to a constant tensile force corresponding to a lower stress than that at flow. The time or stress at which the specimen breaks is recorded.

Environmental stress cracking of test specimens is determined by one of the following methods A and B:

• Method A: Determination of tensile stress causing rupture at 100 hours. This stress is obtained by interpolating the applied tensile stress vs. rupture time plot;
• Method B: Determination of breaking time under a certain tensile stress. This method is used when the breakout time exceeds 100 hours.

EUROLAB assists manufacturers with ISO 6252 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.