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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The values given in parentheses are for information only. A suggested design is given in Fig. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

There is no known ISO equivalent to this standard. See Test Methods D for descriptions of suitable micrometers. 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.

However, the velocity of a free-falling object is a function of the square root of the drop height. The test is often wstm to specify appropriate materials for applications involving impact or to evaluate the effect of secondary finishing operations or other environmental factors on plastic ast properties.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? This test can be carried out at any reasonable temperature and humidity, thus representing actualuse environments. Link to Active This link will always route to the current Active version of the standard.


Assurance Testing Inspection V5420. Data in these tables are speci? Round the top edge of the opening in each specimen-support plate to a 1. However, the velocity of a free-falling object is a function of the square root of the drop height.

Gardner Impact ASTM D, D

The specimens shall be free of obvious imperfections, unless the imperfections constitute a variable under study. However, the apparatus can be modi? D 20 — Place this block or base at a height suitable for ease of operation.

Machining specimens to reduce thickness variation is not permissible. Thus, use impact tests only to obtain relative rankings of materials. Then a series of 20 impacts are conducted. Different materials respond differently to changes in the velocity of impact.

Gardner Impact ASTM D4226, D5420

Consult relevant material standards for processing guidelines FIG. NOTE 3—Such block dimensions conform to commercially available butcher block tables.

NOTE 5—Normally the specimen is not clamped because the test apparatus does not have provision for clamping. The most common method to analyze this data is called the “Bruceton Staircase” method.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Different materials respond differently to changes in the velocity of impact. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

If a test sample fails, the drop height is decreased by one unit. Any flat specimens can be tested – the preferred test sample is a mm 4″ disk or plaque.


Evaluating how your products and services meet and exceed quality, safety, sustainability and performance standards. D — 98a: Global Reach Intertek is the industry leader with over 42, people in 1, locations in over countries. Refer asym the appropriate material speci?

Current edition approved February 1, There is no known means for correlating the results of tests made by different methods or procedures. Send us a request Wilton UK: Ensure that the same surface or area, or both, is targeted on all test specimens. For example, in some cases incipient cracking in glass-reinforced polymers is difficult to differentiate from the reinforcing?

For some polymers, for example, glassreinforced polyester, it is difficult to assess incipient cracking with the naked eye. Warning—The following explanations of r and R Hagan, et al 2 found that the mean-failure energy 6.

ASTM D5420

For the convenience of the user, Committee D20 has highlighted those changes that impact the use of this test method. 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.

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. Production parts shall be tested in the as-received condition to determine conformance to speci?

The test sample rests on a base plate over an opening of specified diameter.