Two films, both mono-PE. One is 6x stronger along the web, the other twice as strong across it.  They are not interchangeable.

When a brand moves to mono-PE for the recycling story, the question usually asked is which film. The question that actually decides the pack is: which direction.

On the data sheets we work from, MDOPE at 25 μm reads about 200 MPa along the machine direction and 32 across it, a ratio of six to one. That stretch is what gives a stand-up pouch its dead-fold and its shape on the shelf. BOPE flips the map: roughly 95 along, 180 across. Twice as strong across as along, same polymer family, same recycling stream.

So the choice is not a performance ranking. It is an orientation question. Decide where the pouch carries its load, which way your filler pulls hardest, and which way the tear should run. A tear line drawn for one film is drawn the wrong way for the other.

The quote sheet will not tell these two films apart. The structure drawing, with tensile in both directions, will.

Which way does the tear-open run on the pouch in front of you, with the web or across it?