This test shows a textile ribbon being pulled apart at a constant rate of speed until it breaks. Measurements include the force required to break the sample and the amount the material stretched before breaking (elongation).

To determine the breaking strength, elongation, etc. of threads, yarns, or other single strand textiles, ASTM D2256 is by far the most common specification that is followed.  This is a relatively simple tensile test whereby thread is pulled at a constant rate of speed until it breaks.  Please see the video below that shows how the test is performed:

Two pieces of nonwoven fiber joined at the edges by sewn thread are pulled apart at a constant rate of speed to measure the maximum peak force of the seam.  Video below: