(MD strip tensile) strength is probably the next most popularly measured web property after thickness/weight. Yet, the ability of test lab strength to predict real-world runnability is not merely limited, it can be little better than consulting a random-number generator or Ouija board.
Strong statement, but I will stand by this. The reasons for this are many but include insufficient sample size, statistical confidence, failure mode discrepancies and the lack of consideration of the (customer’s) equipment it will be running on. There are more predictive measurement methods, but they are involved. See some of the reasons why we should be quite wary of using strength to predict performance.
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