tear resistance of films

various material analysis – tear resistance of films (elmendorf)

tear resistance of films (elmendorf)

Tear resistance is the mean force needed to tear a single thickness of sample of plastic film, textile, paper or board. The tear testing can be undertaken either in the tensile testing machine or using the pendulum method (Elmendorf tear tester).

The Elmendorf method is shown in ASTM D1922. The tearing force is generated by the release of the pendulum to which one half of the sample is clamped and the other half being attached to the stationary clamp. The Elmendorf tear test exerts a shearing force perpendicular to the surface of the sample. A test sample normally comprises a pack of 4 sheets of the same direction torn simultaneously. The tear test result units should be millinewtons (mN).

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