Standard Test Method for Tearing Strength of Nonwoven Fabrics by Falling-Pendulum (Elmendorf) Apparatus

1.1 This test method covers the measurement of the average force required to propagate a single-rip tear starting from a cut in a nonwoven fabric using a falling-pendulum (Elmendorf) apparatus.

1.2 This standard Elmendorf tear tester with interchangeable pendulums has become the preferred test apparatus for determining tearing strength up to 6400 grams-force. It is recognized that some older test instruments with augmenting weights continue to be used. As a consequence, these older test instruments may be used when agreed upon between the purchaser and the supplier. The conditions for the older units as used with this test method are included in the appendix. For tearing strength above 6400 grams-force, a high-capacity test instrument is available equipped with augmenting weights to increase the capacity.

1.3 This test method is applicable to most nonwoven fabrics that are treated or untreated, including heavily sized, coated, or resin-treated, provided the fabric does not tear in the direction crosswise to the direction of the force applied during the test. If the tear does not occur in the direction of the test, the fabric is considered untearable in that direction by this test method.

1.4 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses may be approximate.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.