Instruments as per ASTM D689

Standard Method to test Internal Tearing Resistance of Paper

The standard method measures the force perpendicular to the plane of the paper required to tear multiple sheets of paper through a specified distance after the tear has been initiated, using an Elmendorf-type tearing tester. The results can be used to compute the approximate value of tearing resistance of a single paper. In such case, tearing a single sheet of paper, the tearing resistance is measured easily and directly.