What are methods used to test the durability of paper?

Question

What are methods used to test the durability of paper?

Answer 1

The US Treasury uses a machine that folds and unfolds a paper dollar thousands of times to test for strength.

Paper and cardboard are sometimes given the drop test for strength. Paper is held in place as a weight is dropped from a measured height onto it

Some paper is made to be fire retardant and given a flame test.

The rub tester tests abrasion resistance of printed materials like labels, folding cartons, corrugated boxes, inserts, circulars, and other packaging materials having applied graphics on a flat substrate

The puncture tester measures the energy required to puncture container board or corrugated board with a pyramidal point affixed to a pendulum arm.

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Answer 2

lots but why??????????