ASTM D1424 PDF

This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D on Textiles. Jan 1, Buy ASTM D R TEST METHOD FOR TEARING STRENGTH OF FABRICS BY FALLING-PENDULUM (ELMENDORF-TYPE). The ASTM D Elmendorf based tear test is the most popular test for measuring the tearing strength of most fabrics. The Elmendorf test testing machine uses.

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Comparative tests as directed in 5. Statistical assistance is recommended for the investigation of bias. NOTE 6—Some instruments may require different calculations than percentage of scale. Take the specimens to be used for the measurement of the cross-machine with the longer dimension parallel to the cross-machine direction.

Sstm jeans and other clothing is a very popular style today. Statistical assistance is recommended for the investigation of bias.

Use the cutting die described in 6. Apply a small amount of silicone grease to the air clamp plunger rods. Label to maintain specimen identity. COF Inclined Plane Tester Measure the static coefficient of friction of various materials using a variable inclined plane and a sliding block. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier awtm agree to interpret future test results with consideration to the known bias.

Instructions are provided for testing specimens with, or without, wetting.

ASTM D Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus

Visually check the alignment of the clamps. NOTE 7—The tabulated values of the critical differences should be considered to be a general statement, particularly with respect to betweenlaboratory precision. For rolls of fabric, take a sample that will exclude fabric from the outer wrap of the roll or the inner wrap around the core of the roll of fabric.

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The components of variance for Elmendorf tear strength expressed as standard deviations were calculated to be the values listed in Table 3. See Test Methods D and D For atm, at grams of the gram scale.

ASTM D1424 Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus

D — 09 Ensure the gage is positioned with the wide dimension upwards and the projection extending over the edge of the stationary clamp far enough such that the knife can be adjusted 6 to the bottom edge of the gage.

As a minimum, the d14424 parties should take a group of test specimens astmm are as homogeneous as possible and that are from a lot of fabric of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. Analysis of the data was conducted using Practice D and Practice D Oxygen Permeability Tester to test containers.

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. When equipped, set the pointer against its stop. Consequently no multi-fabric comparisons were made. The lower the follow-through angle the more energy has been transferred into tearing the specimen.

It measures the amount of energy required to perform the tearing operation by measuring the peak follow-through angle of the pendulum after the tearing action. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The falling pendulum propagates this pre-notch to a complete tear through the center of the fabric specimen. Describe the fabric or product sampled and the method of sampling used. One of the variables in Elmendorf tear testing is the orientation of the fabric.

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Catch the pendulum just after the threshold of its backward swing and return to its locked starting position. Adjust the knife position such that the highest point of the blade just touches the bottom edge d11424 the gage and then secure it in place. Consider the rolls or pieces of fabric to be the primary sampling units.

This standard has been approved for use by agencies d14244 the Department of Defense. Within this limitation, Test Method D has no known bias. Before a meaningful statement can be made about two speci?

There were sufficient differences related to the fabric type and structure to warrant listing the components of variance and the critical differences separately. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Movement of the instrument during the swinging of the pendulum is a signi? The direction of orientation of the fabric should be noted in the test report. Remove the jaw spacer gage.

This requires quantification of the tearing strength of the fabric in the test lab. Two operators in each laboratory each tested eight specimens of each fabric using Test Method D