ASTM International - ASTM D4812-19

Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics

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Organization: ASTM International
Publication Date: 1 October 2019
Status: active
Page Count: 12
ICS Code (Other rubber and plastics products): 83.140.99
significance And Use:

5.1 The pendulum-impact test indicates the energy to break standard test specimens of specified size under stipulated conditions of specimen mounting and pendulum velocity at... View More

scope:

1.1 This test method covers the determination of the resistance of plastics to breakage by flexural shock, as indicated by the energy extracted from standardized pendulum-type hammers, mounted in standardized machines, in breaking standard specimens with one pendulum swing. The result of this test method is reported as energy absorbed per unit of specimen width.

Note 1: The pendulum-type test instruments have been standardized in that they must comply with certain requirements, including a fixed height of hammer fall that results in a substantially fixed velocity of the hammer at the moment of impact. Pendulums of different initial energies (produced by varying their effective weights) are recommended for use with specimens of different impact strengths. Moreover, manufacturers of the equipment are permitted to use different lengths and constructions of pendulums (with resulting possible differences in pendulum rigidities (see Section 5), and other differences in machine design).

1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Note 2: This standard and ISO 180, Method U address the same subject matter, but differ in technical content.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Document History

ASTM D4812-19
October 1, 2019
Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
5.1 The pendulum-impact test indicates the energy to break standard test specimens of specified size under stipulated conditions of specimen mounting and pendulum velocity at impact. 5.2 The energy...
December 1, 2011
Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
The pendulum-impact test indicates the energy to break standard test specimens of specified size under stipulated conditions of specimen mounting and pendulum velocity at impact. The energy lost by...
March 15, 2006
Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
1.1 This test method covers the determination of the resistance of plastics to breakage by flexural shock, as indicated by the energy extracted from standardized pendulum-type hammers, mounted in...
November 1, 2005
Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics
1.1 This test method covers the determination of the resistance of plastics to breakage by flexural shock, as indicated by the energy extracted from standardized pendulum-type hammers, mounted in...
March 10, 1999
Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics
1.1 This test method covers the determination of the resistance to breakage by flexural shock of plastics, as indicated by the energy extracted from standardized (Note 1) pendulum-type hammers,...
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