The ASTM D5587 test standard uses the trapezoid procedure to determine the tearing strength of nonwoven fabrics. This test method provides valuable information about a fabric's ability to resist a continuous tear from an object such as a nail or bolt.
Specimens are cut in the shape of an isosceles trapezoid and then a small cut is made on one side of the trapezoid. The specimen is clamped in the jaw faces in a manner which allows the tear to propagate as the jaws move apart. Force and extension data is recorded that subsequently allows the trapezoid tearing strength to be calculated. Tearing strength can be calculated as either the single-peak force or the average of five highest peaks. For this test, a sampling rate as high as 500 Hz is recommended.
The trapezoid procedure requires the jaw faces to be at least 2 inches x 3 inches. The type of grips used should be pneumatic side action grips because they prevent slippage. We recommend using the pneumatic grips on a single or dual column universal testing machine. Bluehill® 2 Software is highly recommended for these tests because it provides the appropriate test control, accurately reports tearing strength, and creates a report.
We recommend that you review ASTM D5587 in its entirety to understand the full requirements prior to performing any testing.