ASTM D4226, D5420 Gardner Impact Test

Falling Dart Impact Test (Gardner Impact) by ASTM D4226 and ASTM D5420 testing impact resistance of flat, rigid plastic materials. The impact test is needed for products that are damaged by some extent of impact force and several types of organic coatings.... Read More

  • Average 30% Cost
    Savings

  • 100% Confidentiality
    Guarantee

  • Free, No-obligation
    Consultation

  • 100% Customer
    Satisfaction

    TRUSTED BY ENGINEERS FROM

    Scope:

    Falling Dart Impact Test by ASTM D4226 and ASTM D5420 is a standard test method in plastic industries for testing impact resistance of flat, rigid plastic materials employing a striker hit by a falling weight. This test is also known as the Gardner impact test. The ASTM D4226 and ASTM D5420 test is needed for products that are damaged by some extent of impact force. The Falling Dart Impact Test is specifically used to establish quality standards for resistance to impact surface defacement and penetration of the underlying layer of construction materials, such as plastic materials, fibreglass, resins, sheet metals, etc. It also tests the ‘impact resistance’ of several types of organic coatings.  

    Test Procedure:

    The ASTM D4226 and ASTM D5420 test sample is kept on a base plate over an opening of the measured diameter. A specific weight impact striker sits on top of the test sample with a nose of a specified radius touching the center of the test sample. The drop height, drop weight, and test result (pass/fail) are recorded. “Bruceton Staircase” is a method that gives the most precise way of analyzing this data. As many as 20 specimens are used to bracket the pass/fail energy grade. Gradually the distance is increased, and as the weight drops, the failure point can be determined. In case a test sample has passed, drop height will be moved ahead by one unit. In case a sample fails, drop height goes back one unit. Mean Failure Height is calculated from those 20 impact results, at which 50 percent of the test samples failed.

    Specimen size:

    For optimal results using the Bruceton method, 20-30 test samples are necessary. Specimens tested are flat. The best test sample is a 100 mm (4 inches) disc.

    Data:

    Mean Failure Height is given in cm (or inches).

    Mean Failure Energy is given in kg-cm (or in-lb).

    Conclusion:

    Hence, ASTM D4226 and ASTM D5420 is a standard test method for evaluating the impact strength or toughness of a plastic material.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  
          STEP 01

          You share material and testing requirements with us

        •  
          STEP 02

          You ship your sample to us or arrange for us to pick it up.

        •  
          STEP 03

          We deliver the test report to your email.

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Quick Turnaround and Hasslefree process
          • Confidentiality Guarantee
          • Free, No-obligation Consultation
          • 100% Customer Satisfaction

            ddd

            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?