ASTM F2231-02(2008)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F2231 − 02(Reapproved 2008) An American National Standard
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 4. Summary of Test Method
1.1 Thistestmethoddescribesthespecimenpreparationand 4.1 The Charpy specimen is 3 mm thick and taken from a
the method of measuring the impact energy of polyethylene compression-molded plaque of the resin. The specimen is
used in pressurized pipes. notched precisely with a razor blade and tested between 19 °C
and 27°C.
1.2 The test specimens are taken from compression molded
plaques of the resin from pellets or pipe.
5. Significance and Use
1.3 Units—The values stated in SI units are to be regarded
4,5
5.1 Brown and Lu show the Charpy impact energy is
as standard. No other units of measurement are included in this
related to the ultimate critical temperature of the rapid crack
standard.
propagation [RCP] behavior as measured by the ISO 13477,
1.4 This standard does not purport to address all of the
S-4 test.
safety concerns, if any, associated with its use. It is the
5.2 The test method may be used to determine the impact
responsibility of the user of this standard to establish appro-
energy of polyethylene used in the manufacture of pipe . This
priate safety and health practices and determine the applica-
test method involves the preparation of a small compression
bility of regulatory limitations prior to use.
molded specimen of PE resin that is then notched in a specified
manner. The specimen is then broken in a pendulum impact
2. Referenced Documents
machine. The impact energy is recorded in joules. The value
2.1 ASTM Standards:
obtained is referred to as the Charpy impact energy.
D6110 Test Method for Determining the Charpy Impact
Resistance of Notched Specimens of Plastics
6. Apparatus
F412 Terminology Relating to Plastic Piping Systems
6.1 Impact Tester, with input energy of 1 to 3 J and impact
2.2 ISO Standard:
velocity of about 3.0 µs. The energy loss shall be measured
ISO 13477 Small Scale Steady State S-4 Test
with a precision of 6 0.004 J.
3. Terminology
6.2 Notching Machine, shall be capable of notching with a
3.1 General—Definitions are in accordance with Terminol- razor blade with a precision of 6 0.01 mm and pressing the
ogy F412 unless otherwise indicated. razor blade into the specimen.
3.2 Definitions of Terms Specific to this Standard: 6.3 Details concerning pendulum impact machines are in
Test Method D6110 section on Apparatus.
3.3 ultimate critical temperature, (CT)—for RCP in a pres-
surized pipe, the temperature above which RCP is not possible
7. Test Specimen
at any pressure based on ISO 13477.
7.1 The specimen is machined from the compression
moldedplaqueoftheresin.Theresinmaycomefrompelletsor
This test method is under the jurisdiction of ASTM Committee F17 on Plastic
from sections taken from a pipe.
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test
Methods.
7.2 The specimen geometry is shown in Fig. 1.
Current edition approved July 1, 2008. Published September 2008. Originally
´1
approved in 2002. Last previous edition approved in 2002 as F2231–02 . DOI:
10.1520/F2231-02R08.
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 onthePlaneStressFractureEnergyoftheResin,” 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.
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