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NASTA specifications require 40-lb. to 44-lb. paper to have a minimum average tearing strength of 28 grams in each direction, when tested according to TAPPI T-414 (TAPPI is the Technical Association of the Pulp and Paper Industry).
This is the same spec for 45-lb. to 49-lb. papers. The bursting strength specification is no less than 16 points (psi), when tested according to TAPPI T-403, for 40-lb. to 44-lb. basis weights, and 45- lb. to 54 lb. basis weights. (Bursting strength is the amount of uniform pressure, in pounds per square inch, required to pull a sheet of paper apart.)
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