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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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments will receive careful consideration at a meeting of the responsible technical committee, which d54220 may attend. For some polymers, for example, glassreinforced polyester, it is difficult to assess incipient cracking with the naked eye.

NOTE 4—As few as ten specimens often yield sufficiently reliable estimates of the mean-failure height. Send us a request Wilton UK: Assurance Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes.

Round the top edge of the opening in each specimen-support plate to a 1. Consult relevant material standards for processing guidelines FIG. Originally approved in Use one symbol, such as X, to aastm a failure and a different symbol, such as O, to indicate a nonfailure at each height level.


However, the selection of any one of the striker geometries is permitted, after such consideration. Certification Formally confirming that your products and services meet all trusted external and internal standards.


The test is often used to specify appropriate materials for applications involving impact or to evaluate the effect of secondary finishing operations or other environmental factors on plastic impact properties. Production parts shall be tested in the as-received condition to determine conformance to speci? Evaluating d4520 your products and services meet and exceed quality, safety, sustainability and performance standards.

Adapt the apparatus from Test Method D for use in this test method or obtain the apparatus commercially. Refer to the appropriate material speci? In such cases, apply a penetrating dye such as gentian violet to the stressed surface to determine the onset of crack formation.

Gardner Impact ASTM D, D

Thus, use impact tests only to obtain relative rankings of materials. NOTE 5—Normally the specimen is not clamped because the test apparatus does not have provision for clamping. MFE 5 hwf 2 ini, where: 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.

NOTE 2—Material processing can have a signi? If the approximate mean-failure height is unknown, six or more additional specimens shall be used to determine the appropriate starting point of the test. The specimens shall be free of obvious imperfections, unless the imperfections constitute a variable under study.

Inspection Validating the specifications, value and safety of your raw materials, products and assets. If a test sample passes, the drop height is increased by one unit. Twenty specimens were used for each sample calculation, with a minimum of specimens used for each averaged test result. The main body of the block or base shall have maximum dimensions of 16 by 30 by 30 in. For each different material tested, make com- FIG.


ASTM D5420

A sample computation of sw is found in Appendix X1. There is no known ISO equivalent to this standard.

The selection of any one of the striker geometries is permitted. Then a series of 20 impacts are conducted. 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.

The positive sign is used when the events are nonfailures. The apparatus shall consist of the following: A change of a factor of two in the drop height will cause a change of only 1. For example, in some cases incipient cracking in glass-reinforced polymers is difficult to differentiate from the reinforcing? Material processing can have a significant affect on the development of a plastic’s physical properties. Standards can be obtained from appropriate standards authorities.