ASTM D4812-19e1
Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics

Standard No.

ASTM D4812-19e1

Release Date

2019

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4812-19e1

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.

ASTM D4812-19e1 Referenced Document

• ASTM D256 Standard Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics*， 2023-03-15 Update
• ASTM D5947 Standard Test Methods for Physical Dimensions of Solid Plastics Specimens
• ASTM D618 Standard Practice for Conditioning Plastics for Testing*， 2021-07-15 Update
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E2935 Standard Practice for Evaluating Equivalence of Two Testing Processes*， 2021-06-01 Update
• ASTM E456 Standard Terminology for Relating to Quality and Statistics
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D4812-19e1 history

• 2019 ASTM D4812-19e1 Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
• 2019 ASTM D4812-19 Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
• 2011 ASTM D4812-11 Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
• 2006 ASTM D4812-06 Standard Test Method for Unnotched Cantilever Beam Impact Resistance of Plastics
• 2005 ASTM D4812-05 Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics
• 1999 ASTM D4812-99 Standard Test Method for Unnotched Cantilever Beam Impact Strength of Plastics