{"id":3380,"date":"2026-07-23T06:21:45","date_gmt":"2026-07-23T06:21:45","guid":{"rendered":"https:\/\/www.materialstests.com\/?post_type=application&p=3380"},"modified":"2026-07-23T06:22:36","modified_gmt":"2026-07-23T06:22:36","slug":"astm-d1922","status":"publish","type":"application","link":"https:\/\/www.materialstests.com\/ar\/application\/astm-d1922.html","title":{"rendered":"ASTM D1922"},"content":{"rendered":"


ASTM D1922 Tear Resistance Test Using Elmendorf Tear Tester<\/strong><\/h2>\n\n\n\n

When selecting flexible packaging materials, industrial films, or laminated structures, ASTM D1922<\/strong> is one of the most widely recognized standards for evaluating tear resistance of plastic film<\/strong>. A material may exhibit excellent tensile strength yet fail unexpectedly once a small cut or notch develops during manufacturing, transportation, or end use. Measuring tear resistance helps manufacturers understand how a crack propagates under load and whether the material can withstand real-world handling.<\/p>\n\n\n\n

\u0625\u0646 tearing test by pendulum method<\/strong> \u0627\u0644\u0645\u0648\u0635\u0648\u0641\u0629 \u0641\u064a ASTM D1922<\/strong> provides a reliable and repeatable way to quantify tear propagation energy. Using an \u062c\u0647\u0627\u0632 \u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u062f\u0645\u0648\u0639 \u0625\u0644\u0645\u064a\u0646\u062f\u0648\u0631\u0641<\/strong>, laboratories can compare different film formulations, optimize production processes, and establish quality control specifications for plastic films and thin sheeting.<\/p>\n\n\n\n

What Is ASTM D1922?<\/h2>\n\n\n\n

ASTM D1922<\/strong> is the standard test method for determining the propagation tear resistance of plastic film and thin sheeting by the pendulum method<\/strong>. Rather than measuring the force required to initiate a tear, the method evaluates the energy needed to continue tearing a specimen that already contains a precisely prepared slit.<\/p>\n\n\n\n

This distinction is important because many packaging failures begin with small defects created during converting, sealing, transportation, or consumer use. Understanding tear propagation provides valuable insight into product durability.<\/p>\n\n\n\n

\"ASTM<\/figure>\n\n\n\n

The standard is commonly applied in:<\/p>\n\n\n\n

    \n
  • Flexible packaging<\/li>\n\n\n\n
  • Agricultural films<\/li>\n\n\n\n
  • Stretch and shrink films<\/li>\n\n\n\n
  • Barrier laminates<\/li>\n\n\n\n
  • Medical packaging films<\/li>\n\n\n\n
  • Industrial protective films<\/li>\n\n\n\n
  • Plastic sheets up to approximately 1 mm thick<\/li>\n<\/ul>\n\n\n\n

    Why Measure Tear Resistance of Plastic Film?<\/h2>\n\n\n\n

    \u0625\u0646 tear resistance of plastic film<\/strong> directly influences product performance throughout manufacturing, logistics, and final use.<\/p>\n\n\n\n

    Typical quality concerns include:<\/p>\n\n\n\n

      \n
    • Package tearing during filling<\/li>\n\n\n\n
    • Film damage during transportation<\/li>\n\n\n\n
    • Consumer opening performance<\/li>\n\n\n\n
    • Machine-direction versus transverse-direction durability<\/li>\n\n\n\n
    • Material consistency between production batches<\/li>\n<\/ul>\n\n\n\n

      By evaluating tear resistance, manufacturers can:<\/p>\n\n\n\n

        \n
      • Improve product durability<\/li>\n\n\n\n
      • Reduce packaging failures<\/li>\n\n\n\n
      • Compare different resin formulations<\/li>\n\n\n\n
      • Optimize film thickness<\/li>\n\n\n\n
      • Verify supplier quality<\/li>\n\n\n\n
      • Support new product development<\/li>\n<\/ul>\n\n\n\n

        Principle of the Tearing Test by Pendulum Method<\/h2>\n\n\n\n

        \u0625\u0646 tearing test by pendulum method<\/strong> is based on measuring the energy absorbed while a pendulum continues tearing a pre-notched specimen.<\/p>\n\n\n\n

        The test sequence includes:<\/p>\n\n\n\n

          \n
        1. A standard specimen is prepared.<\/li>\n\n\n\n
        2. A precisely controlled slit is introduced.<\/li>\n\n\n\n
        3. The specimen is clamped securely.<\/li>\n\n\n\n
        4. The pendulum is released.<\/li>\n\n\n\n
        5. As the pendulum swings, it tears the remaining material.<\/li>\n\n\n\n
        6. The loss of pendulum energy is converted into tear resistance.<\/li>\n<\/ol>\n\n\n\n

          Because the measurement is based on energy rather than continuous force, the method provides highly repeatable results for thin plastic films.<\/p>\n\n\n\n

          Test Equipment: Elmendorf Tear Tester<\/h2>\n\n\n\n

          \u0623\u0646 \u062c\u0647\u0627\u0632 \u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u062f\u0645\u0648\u0639 \u0625\u0644\u0645\u064a\u0646\u062f\u0648\u0631\u0641<\/a><\/strong> is specifically designed to perform ASTM D1922<\/strong> testing.<\/p>\n\n\n\n

          Typical instrument components include:<\/p>\n\n\n\n

          Component<\/th>Function<\/th><\/tr><\/thead>
          Pendulum<\/td>Supplies tearing energy<\/td><\/tr>
          Pneumatic clamps<\/td>Secure the specimen uniformly<\/td><\/tr>
          Specimen cutter<\/td>Produces the standard slit<\/td><\/tr>
          PLC controller<\/td>Controls testing sequence<\/td><\/tr>
          Touchscreen HMI<\/td>Simplifies operation<\/td><\/tr>
          Calibration weights<\/td>Verify measurement accuracy<\/td><\/tr>
          Data processing software<\/td>Calculates average tear values<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

          Modern electronic systems improve repeatability while reducing operator influence compared with traditional mechanical designs.<\/p>\n\n\n\n

          ASTM D1922 Test Procedure<\/h2>\n\n\n\n

          Although laboratories should always follow the official standard, the general procedure includes the following steps.<\/p>\n\n\n\n

          1. \u062a\u062d\u0636\u064a\u0631 \u0627\u0644\u0639\u064a\u0646\u0629<\/h3>\n\n\n\n

          Film specimens are cut to the required dimensions.<\/p>\n\n\n\n

          A standard slit is produced so that the tear will propagate over a defined distance.<\/p>\n\n\n\n

          Proper specimen preparation is critical because slit quality directly affects repeatability.<\/p>\n\n\n\n

          2. Specimen Installation<\/h3>\n\n\n\n

          The specimen is mounted in the clamps of the \u062c\u0647\u0627\u0632 \u0627\u062e\u062a\u0628\u0627\u0631 \u0627\u0644\u062f\u0645\u0648\u0639 \u0625\u0644\u0645\u064a\u0646\u062f\u0648\u0631\u0641<\/strong>.<\/p>\n\n\n\n

          Proper alignment prevents twisting and ensures uniform tear propagation.<\/p>\n\n\n\n

          3. Pendulum Release<\/h3>\n\n\n\n

          The pendulum is released automatically.<\/p>\n\n\n\n

          Gravity accelerates the pendulum through the specimen, continuing the tear.<\/p>\n\n\n\n

          4. Energy Measurement<\/h3>\n\n\n\n

          The instrument measures the pendulum’s energy loss during tearing.<\/p>\n\n\n\n

          The absorbed energy is converted into tear resistance values, typically expressed in grams-force (gf) or millinewtons (mN).<\/p>\n\n\n\n

          5. Statistical Analysis<\/h3>\n\n\n\n

          Multiple specimens are tested.<\/p>\n\n\n\n

          The software automatically calculates:<\/p>\n\n\n\n