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Specifies a method to measure the elongation of a self adhesive tape when it is subjected to a tensile force sufficient to cause it to break. The elongation at break of the adhesive tape is of value as an indication of its uniformity and quality, as well as a rough indication of its ability to conform to curved and irregular surfaces. It is usually determined at the same time as the breaking strength. The maximum width of adhesive tape tested by this method is 25 mm. For adhesive tapes of this width or less, the elongation at break measured corresponds to that as supplied commercially, with factory-cut edges. For adhesive tapes wider than 25 mm, this test method provides for the tape to be cut down to 25 mm with a well-sharpened instrument. In such cases, because of the better cutting of the edges, the results can be higher than would be found on commercial adhesive tape.