Elmendorf Tear Tester

Elmendorf Tear Tester

Standards:

• ASTM D1922, ASTM D1424, ASTM D689, ISO 6383, ISO1974, and TAPPI T414.

ASTM D1922-15(2020): Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by Pendulum Method

This testing method is valuable for comparing the relative tearing resistance of different plastic films and thin sheets with similar thickness. It's been observed that this test is most reliable for films and sheeting with lower extensibility. Films with variable elongation and oblique tearing effects, particularly those with higher extensibility, may not yield precise results, making it unsuitable for precise production control in such cases. Therefore, it's recommended to use this test method for specification acceptance testing only after ensuring the reproducibility of data for the specific material. Similarly, for service evaluation, it's advised to demonstrate its usefulness for the particular application using various films.

This test method has been widely adopted as an indicator of tearing resistance for plastic films and thin sheeting used in packaging. While it may not always correlate directly with other mechanical or toughness properties of the film, the apparatus used in this method provides a controlled environment for tearing specimens at rates similar to those encountered in real packaging scenarios.

ASTM D1424-21: Standard Test Method for Tearing Strength of Fabrics by Falling-Pendulum (Elmendorf-Type) Apparatus

This test method, utilizing a falling pendulum-type apparatus, is commonly employed in the industry for assessing the tearing strength of fabrics during the acceptance testing of commercial shipments.

ASTM D689-17: Standard Test Method for Internal Tearing Resistance of Paper

This test method is extensively utilized in the paper industry alongside other strength tests to forecast the end-use performance of various grades of papers.