Two grades of an item:
1. 28 pounds per square inch tensile strength and 2.2 mil. thick.
2. 20 pounds per square inch tensile strength and 1.8 mil. thick.
Obviously 1 is more secure. However, the question is how un-secure is 2 compared to 3..?
2 may be perfect and the extra cost for 1 not be worth it.
Well the last roll I just finished using looks like it was 30 pound and 2.8 thick.
However, the rolls used before that may not have been near as thick or strong.
So, for 3 above, I'd compare to the cheapo rolls off Ebay vs. the Scotch 30lb and 2.8 since the Ebay tape was used more often. I had like 4 rolls of that and it seemed fine before using the heavier Scotch (30 and 2.8)