The basic test methods used to determine adhesion, shear resistance and tack of pressure sensitive adhesive tapes have remained virtually unchanged for more than a generation. While they may be adequate to compare the physical properties of tapes of essentially similar construction, or to provide comparative information between batches of the same tape, if the test methods are not properly understood, the information derived can be misleading. Further, by using modified or alternate test methods, much more information can be obtained relative to the performance characteristics of the adhesive. It should be recognized that there are only two types of stress, either individually, or in combination, that can be applied to a pressure sensitive adhesive after application, in an attempt to remove it, and these are ones of tensile, and shear. A more meaningful understanding of the performance of a pressure sensitive adhesive could therefore be gained if the effect of each of these two stresses could be determined independently.
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