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Why is it important to measure and control corrugated board caliper This answer was published in TAPPI TIP 0304-04 Corrugated Caliper: Why Is It So Important and is reproduced in part as follows: Corrugated is a very popular packaging material primarily because it has a high strength-to-weight ratio. What this means is that corrugated is exceptionally strong considering its light weight. In fact, the primary job of a corrugated box is to protect its contents (i.e., our customers products). As such, corrugated should be considered to be an engineering material. It is amazing that we take several flexible pieces of paper and combine them into something very rigid. A 20 20 200-lb. test C-flute corrugated box can withstand almost 900 lbs. of weight before failing and yet it weight only 2.5 lbs. How can corrugated be that strong There are two reasons.