ASTM D1938 Trouser Tear-Propagation Testing on Plastics

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ASTM D1938 is the standard test for tear propagation in plastic films and thin sheeting. Manufacturers of plastics for consumer goods use this test to determine the integrity of the film and sheeting materials, as well as to determine if their products meet customer expectations.

What Is ASTM D1938?

ASTM D1938 test method measures the force necessary to propagate a tear in plastic film and thin sheeting (thickness of 1 mm (0.04 in.) or less) by a single-tear method. The standard is not applicable for film or sheet where brittle failures occur during testing.

What Other Standards Relate to Testing Thin Film & Sheet Plastic?

ASTM D2261ASTM D882 and ISO 6383-1 Film and Sheeting—Determination of Tear Resistance Part 1 Trouser Tear Method

Why Use a Standard Test Method Like ASTM D1938?

ASTM D1938 is useful for support of engineering design and development, to confirm internal quality assurance, to compare one material versus another, to provide a clear specification for commercial transactions, and to provide insights for first time test developers.

ASTM D1938 Test Summary

ASTM D1938 helps rate tear propagation resistance of plastic films and thin sheeting of comparable thickness. Data is analyzed differently between highly extensible film versus slightly extensible film because of the deformation energy involved. The data obtained by this test method furnish information for ranking the tear-propagation resistance of plastic films and sheeting of similar composition. Sets of data from specimens of dissimilar thickness are usually not comparable.

ASTM D1938 Test Data Reporting

The test results include a wide range of tensile properties including tensile strength, tensile modulus, elongation, and Poisson's ratio.

What Test Machines Are Recommended for Plastic Thin Film & Sheet?

Our universal test machines serve multiple plastic testing applications and are capable of performing virtually all quasi static tension/compression tests, such as tensile, peel, and adhesion. Our machines feature a uniform constant rate of extension (CRE), or constant velocity control mode, with a speed range between 1 and 500 mm/min (0.04 to 20 in/min). Force measurement complies with ASTM E4. Consider the 240 family test machine for higher speeds and extended crosshead travel applications.

What Grips Are Recommended for Testing Thin Film & Sheet?

Mechanical Vise Grips like our G227  and G240K grips are universal in nature and feature a variety of interchangeable jaws and accessories.

Spring Action Grips like our G7 eccentric roller handle thin low force materials such as films or sheets. They are the most affordable solution.