The ISO 2411 is suitable for use with the following range of materials: coated fabrics with natural rubber, synthetic rubber, and plastics. This test method is used to investigate the coating adhesion strength of coated fabrics in dry or wet conditions. By pulling apart the layers at a specified speed you can determine the maximum, minimum, and average adhesive strength.
In principle, there are two sets of test specimen created: one in the warp direction and the other in the weft direction of the material according to the standard. The free ends of the test specimen are supported between two clamping jaws and pulled; this separates the layer of specimen for a given length at a constant rate of displacement. The results determination is the average force applied. For this test, it is important to have a test data sampling rate to the PC for analysis as high as 100 Hz to ensure the capture and record of all the peaks and toughs.
For this test, we used pneumatic action grips with rubber coated jaw faces for clamping of the material fitted to a tensile testing machine. While manual action grips will work, many of our users prefer the pneumatic action grips for ease of use, productivity, and better repeatability. Pneumatic action grips allow you to set a clamping pressure, while the manually operated grips depend on the operator's strength, which may not be so repeatable. We find that the gripping pressure and specimen alignment are very important in these tests. Too much gripping pressure can produce premature breaks, while not enough gripping pressure can lead to specimen slippage or breaks at or near the jaws. We also suggest to choose faces that are at least 10 mm wider than the specimen being tested and at least 25 mm - if not more - in height.
We suggest using a tensile testing system of either a single-column or dual-column tabletop design. Materials testing software, such as Bluehill® 2 Software, is ideal to input specimen details, set the desired test control, automatically calculate the desired results and statistics, and produce a test report all in accordance with the standard. For this test type, we use the preload feature of Bluehill to eliminate any slack in the specimen when loading into the clamping grips prior to test.
We suggest reviewing ISO 2411 to fully understand the test fixture and results requirements prior to performing any tests.