ASTM D1938
Standard Test Method for Tear-Propagation Resistance (Trouser Tear) of Plastic Film and Thin Sheeting by a Single-Tear Method
What is the ASTM D1938?
ASTM D1938 test method covers the determination of 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 method is not applicable for film or sheeting material where brittle failures occur during testing.
This test method is of value in rating the tear-propagation resistance of various plastic films and thin sheeting of comparable thickness. For highly extensible film or sheeting the deformation energy of the specimen legs is significantly greater than the tearing energy.
It is a widely recognised and fundamental test method in the polymer and packaging industries for evaluating a specific mode of tear resistance.
Calculation of Tear Strength and the Relationship Between Tear Force and Thickness (ASTM D1938)
Tear strength is not a single, universal property; rather, it is a performance value determined under specific test conditions. Correct interpretation of test data is dependent on accurate calculation and understanding of the relationship with material thickness.
Tear strength is typically expressed as the tear force, which is normalised by the thickness of the material. This standardisation facilitates a comparison of the material's inherent resistance to tearing, irrespective of sample thickness.
The most common formula is:
Tear Strength (kN/m or N/mm) = Tear Force (N) / Thickness (m or mm)
Medical Packaging Tester MED-02
MED-02 Medical Packaging Tester is professionally applicable to the determination of force properties of various pharmaceutical packaging materials.
Intelligent Tensile Testing Machine XLW-L
XLW-L Intelligent Tensile Testing Machine specializes in testing the mechanical properties of various flexible packaging materials.
Thickness Tester CHY-CA
The CHY-CA mechanical contact method thickness tester can be used to measure the thickness of plastic film, paper, cardboard, fabric and sheet materials.
Universal Tensile Testing Machine XLW-H
XLW-H Universal Tensile Testing Machine measures mechanical properties (tensile strength, peel, elongation rate, etc) of various flexible packaging materials.
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About ASTM Standards
Learn more about the ASTM D1938 Test Standards.
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About Saicheng Instrument
Saicheng Instrument Company is a technology-based enterprise dedicated to the development, production and sales of physical property testing instruments. Since its establishment in 2007, the company has provided high-quality testing instruments and comprehensive quality control solutions for packaging, food, pharmaceutical, medical equipment, adhesive products, quality inspection institutions, scientific research institutions, daily chemical industries and other industries.
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