Gardner Impact ASTM D, D Falling Dart Impact (Gardner Impact) ASTM D, ASTM D Scope: Falling dart impact, also known as Gardner. This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D20 on Plastics. ASTM D Standard Test Method for Impact Resistance of Flat, Rigid Plastic Specimen by Means of a Striker Impacted by a Falling Weight (Gardner Impact).

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Gardner Impact ASTM D, D

Assurance Testing Inspection Certification. Refer to the example in Appendix X1.

NOTE 1—Depth of penetration when fully seated shall be A sample computation of sw is found in Appendix X1. NOTE 4—As few as ten specimens often yield sufficiently reliable estimates of the mean-failure height.

Do not apply the data in Table 2 and Table f5420 rigorously for acceptance or rejection of a material.

Hagan, et al 2 found that the mean-failure energy 6. Different materials respond differently to changes in the velocity of impact. Test each specimen only once. Validating the specifications, value and safety of your raw materials, products and assets. Warning—The following explanations of r and R Use a bracket to hold the tube in a vertical position by attaching it to the base and astj to hold the hand knob, which is a pivot arm alignment for the striker, about 50 mm [2 in.

Falling dart impact, also known as Gardner impact, is a traditional method for evaluating the impact strength or toughness of a plastic material.

Precision and Bias 4 The values given in parentheses are for information only. NOTE 3—Such block dimensions conform to commercially available butcher block tables. The selection of any one of the striker geometries is permitted. A superscript epsilon e indicates an editorial change since the last revision or reapproval.


In such cases, it is permissible to expose the stressed surface to a penetrating dye, such as gentian violet, to help determine the onset of cracking. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Use one symbol, such as X, to indicate a failure and a different symbol, such as O, to indicate a nonfailure at each height level. Round the top edge of the opening in each specimen-support plate to a 1.

ASTM D5420

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. NOTE 5—Normally the specimen is not clamped because the test apparatus does not have provision for clamping.

Refer to the appropriate material speci? Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. A change of a factor of two in the drop height will cause a change of only 1. The main body of the block or base shall have maximum dimensions of 16 by 30 by 30 in. If a test sample fails, the drop height is decreased by one unit.

Current edition approved February 1, Originally approved in Send us a request Need help or have a question? Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. Twenty specimens were used for each sample calculation, with a minimum of specimens used for each averaged test result. There is no known ISO equivalent to this standard. Use a random numbers table if desired. However, the velocity of a free-falling object is a function of the square root of the drop height.

Gardner Impact ASTM D4226, D5420

A change of a factor of two in the drop height will d55420 a change of only 1. Practice E to generate data speci? Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world. Consider the end use environment and requirements when choosing from the available striker geometries.


Data obtained with different geometries, cannot, in general, be compared directly with each other. However, this test method is intended primarily for rating materials under speci? However, in such cases the estimated standard deviation will be relatively large 1.

Ensure that the same surface or area, or both, is targeted on all test specimens. Consult relevant material standards for processing guidelines.

Standards can be x5420 from appropriate standards authorities. The apparatus shall consist of the following: Thus, use impact tests only to obtain relative rankings of materials. D — 04 Raise the weight in d54220 tube to the desired impact value, as shown on the appropriate scale, and release it so that the weight drops on the striker.

A weight is raised inside a guide tube to a predetermined height, then released to drop onto the top of the impactor, forcing the nose through the test sample.


For each material, all samples were prepared at one source, but the individual specimens were prepared at the laboratories that tested them. Place this block or base at a height suitable for ease of operation. A number in parentheses indicates the year of last reapproval.

For example, in some cases incipient cracking in glass-reinforced polymers is difficult to differentiate from the reinforcing? For optimum results using the staircase method, a minimum of 30 test samples are necessary.