ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. The values given in brackets are for information only. 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. E Speci?
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This test method covers the determination of the relative ranking of materials according to the energy required to crack or break flat, rigid plastic specimens under various specified conditions of impact of a striker impacted by a falling weight. The values stated in SI units are to be regarded as the standard.
The values given in parentheses are for information only. This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. Browse Publishers.
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Gardner Impact ASTM D4226, D5420
Historical Version s - view previous versions of standard. More D However, the velocity of a free-falling object is a function of the square root of the drop height. A change of a factor of two in the drop height will cause a change of only 1.
ASTM D is a standard test method for impact resistance of flat, rigid plastic specimen by means of a striker impacted by a falling weight gardner impact. This test consists of a fixed weight impacting a striker resting on top of a supported specimen dropped from various heights. When developing and selecting materials for specific applications, the knowledge of how the deformation of a polymer depends on their composition and structure is imperative. The fluid and elastic properties of plastic or, better put, their viscoelasticity makes them sensitive to changes in weight velocities falling on their surface. Different polymers behave differently to changes in the velocity impact and it is crucial to be aware of their behavior. Should you need guidance in deciding which geometry or other elements should be used for your precise needs, feel free to contact us today.
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