He's really not replicating the standard test at all, here's a standard test machine: https://www.youtube.com/watch?v=fEN2eojse3s https://www.youtube.com/watch?

He's really not replicating the standard test at all, here's a standard test machine: https://www.youtube.com/watch?v=fEN2eojse3s https://www.youtube.com/watch?v=fEN2eojse3s In a standard test machine you clamp the material in such a a way as to not introduce deformities in the fabric. I.e. the whole piece should start out flat, his test setup has it clamped around the end of a pipe. You can see in the video how some of the leaks and tears start at the stress points where the fabric is folded near the opening of the pipe. It's meaningless to make any general assumptions about how such a non-standard test setup relates to how a fabric would perform in the standard test.