ASTM F2231-02(2024)

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.
Designation: F2231 − 02 (Reapproved 2024)
Standard Test Method for
Charpy Impact Test on Thin Specimens of Polyethylene
Used in Pressurized Pipes
This standard is issued under the fixed designation F2231; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
3.1 General—Definitions are in accordance with Terminol-
1.1 This test method describes the specimen preparation and
ogy F412 unless otherwise indicated.
the method of measuring the impact energy of polyethylene
used in pressurized pipes.
3.2 Definitions of Terms Specific to this Standard:
1.2 The test specimens are taken from compression molded 3.3 ultimate critical temperature, (CT)—for RCP in a pres-
surized pipe, the temperature above which RCP is not possible
plaques of the resin from pellets or pipe.
at any pressure based on ISO 13477.
1.3 Units—The values stated in SI units are to be regarded
as standard. No other units of measurement are included in this
4. Summary of Test Method
standard.
4.1 The Charpy specimen is 3 mm thick and taken from a
1.4 This standard does not purport to address all of the
compression-molded plaque of the resin. The specimen is
safety concerns, if any, associated with its use. It is the
notched precisely with a razor blade and tested between 19 °C
responsibility of the user of this standard to establish appro-
and 27 °C.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
4,5
1.5 This international standard was developed in accor-
5.1 Brown and Lu show the Charpy impact energy is
dance with internationally recognized principles on standard-
related to the ultimate critical temperature of the rapid crack
ization established in the Decision on Principles for the
propagation [RCP] behavior as measured by the ISO 13477,
Development of International Standards, Guides and Recom-
S-4 test.
mendations issued by the World Trade Organization Technical
5.2 The test method may be used to determine the impact
Barriers to Trade (TBT) Committee.
energy of polyethylene used in the manufacture of pipe . This
test method involves the preparation of a small compression
2. Referenced Documents
molded specimen of PE resin that is then notched in a specified
2.1 ASTM Standards:
manner. The specimen is then broken in a pendulum impact
D6110 Test Method for Determining the Charpy Impact
machine. The impact energy is recorded in joules. The value
Resistance of Notched Specimens of Plastics
obtained is referred to as the Charpy impact energy.
F412 Terminology Relating to Plastic Piping Systems
6. Apparatus
2.2 ISO Standard:
6.1 Impact Tester, with input energy of 1 J to 3 J and impact
ISO 13477 Small Scale Steady State S-4 Test
velocity of about 3.0 μs. The energy loss shall be measured
with a precision of 60.004 J.
6.2 Notching Machine, shall be capable of notching with a
This test method is under the jurisdiction of ASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test
razor blade with a precision of 60.01 mm and pressing the
Methods.
razor blade into the specimen.
Current edition approved Feb. 1, 2024. Published February 2024. Originally
approved in 2002. Last previous edition approved in 2019 as F2231 – 02 (2019).
DOI: 10.1520/F2231-02R24.
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Brown, N. and Lu, X., “Dependence of Rapid Crack Propagation in PE Pipes
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM on the Plane Stress Fracture Energy of the Resin,” Polymer Engineering and Science
Standards volume information, refer to the standard’s Document Summary page on Vol 41, 2001, p. 1140.
the ASTM website. Brown, N. and Lu, X., “A Simple Test to Prevent Rapid Crack Propagation,”
Available from American National Standards Institute (ANSI), 25 W. 43rd St., Plastic Pipes XI, Munich, 2001, p. 583.
4th Floor, New York, NY 10036, http://www.ansi.org. The critical temperature is also related to the dimensions of the pipe.
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