ASTM D1938 covers the determination of the force necessary to propagate a tear in plastic film and thin sheeting by a single-tear method. ASTM D1938 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. The tear-propagation resistance in slightly extensible or non-extensible film or sheeting is distinguished from the tear-propagation resistance in highly extensible film or sheeting by the load-time or load-displacement data. The tear-propagation force for slightly extensible or non-extensible material is determined from the average tear force versus the initial and peak force for a highly extensible material.

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