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Evaluate Impact Resistance of Films with High Accuracy

Falling Dart method or Dart Impact is a traditional method that helps to assess the toughness and the impact strength of the plastic films. The test comprises of some specific configurations such as single dart, single drop height, and different weights of dart according to different standards that are introduced by national and international standardization authorities. All the standards explain different specifications of the apparatus that shows different results. Therefore, it is necessary for the manufacturers to consider the test requirement of the materials to understand the specifications of the apparatus so that best testing device can be selected out of the available options. In this post, we will learn more about Dart Impact Tester and the related the standardized test.

Dart Impact Tester
What are the Applications of Impact Testers?

Dart Impact Test is performed to measure the impact resistance of “Polyethylene Films” when the free-falling dart is applied to the film. This test is used to determine the energy that can cause polyethene films to fail under specific conditions of the free-falling dart. This energy is expressed as “mass or weight of a missile” that falls from a specified height which causes 50% failure of the sample.

Different Test Methods to perform Impact Test

ASTM D1709 – 15a explains two test methods, i.e., Test Method A and Test Method B:

  • Test Method A – Test Method A explains that test is performed in Dart Impact Tester using the dart of 38mm ± 0.13mm, or5 inches ± 0.005 inches in diameter is dropped from a certain height of 660 m ± 1 mm or 26-inch ± 0.4 inches. The test is applied to the films whose impact resistance requires 50 grams or less to 6 kilograms of weight to fracture them.
  • Test Method B – Test Method B explains that test is performed with the dart of 50mm ± 0.13mm or 2.0 inches ± 0.005 inches in diameter is dropped from a certain height of 1520mm ± 3 mm or 60 inches ± 0.25 inch. The test is applied to the films whose impact resistance requires 30 grams or less to 6 kilograms of weight to fracture them.

Presto Stantest manufactures Dart Impact Tester keeping in mind standard ASTM D 1709. Depending upon the specifications, impact strength and thickness of the sample, Method A or Method B are chosen. Following the method, the required number of samples is tested to measure appropriate starting point for the weight of the dart and measure the impact resistance of films.

Dart Impact Tester
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Few key features we deliver:

  • The machine is designed and built on a rigid metal base plate.
  • It has strong electromagnetic dart holders.
  • The dart is released at the press of a button.
  • It provides fast, reliable and accurate measurements from uneven heights.
  • The instrument is supplied with a conformance certificate traceable to NABL and Instruction Manual.

Kindly contact us here, for more information.

 


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