ASTM F2231-02e1

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An American National Standard
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Designation:F2231–02
Standard Test Method for
Charpy Impact Test on Thin Specimens of Polyethylene
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Used in Pressurized Pipes
This standard is issued under the fixed designation F 2231; 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 (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Editorial corrections were made throughout in July 2003.
1. Scope 5. Significance and Use
,
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1.1 Thistestmethoddescribesthespecimenpreparationand 5.1 Brown and Lu show the Charpy impact energy is
the method of measuring the impact energy of polyethylene related to the ultimate critical temperature of the rapid crack
used in pressurized pipes. propagation [RCP] behavior as measured by the ISO 13477,
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1.2 The test specimens are taken from compression molded S-4 test.
plaques of the resin from pellets or pipe. 5.2 The test method may be used to determine the impact
1.3 Units—The values stated in SI units are to be regarded energy of polyethylene used in the manufacture of pipe . This
as standard. No other units of measurement are included in this test method involves the preparation of a small compression
standard. molded specimen of PE resin that is then notched in a specified
1.4 This standard does not purport to address all of the manner. The specimen is then broken in a pendulum impact
safety concerns, if any, associated with its use. It is the machine. The impact energy is recorded in joules. The value
responsibility of the user of this standard to establish appro- obtained is referred to as the Charpy impact energy.
priate safety and health practices and determine the applica-
6. Apparatus
bility of regulatory limitations prior to use.
6.1 Impact Tester, with input energy of 1 to 3 J and impact
2. Referenced Documents
velocity of about 3.0 µs. The energy loss shall be measured
2.1 ASTM Standards: with a precision of 6 0.004 J.
D 6110 Test Method for Determining the Charpy Impact 6.2 Notching Machine, shall be capable of notching with a
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Resistance razor blade with a precision of 6 0.01 mm and pressing the
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F 412 Terminology Relating to Plastic Piping Systems razor blade into the specimen.
2.2 ISO Standard: 6.3 Details concerning pendulum impact machines are in
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ISO 13477 Small Scale Steady State S-4 Test Test MethodD6110 section on Apparatus.
3. Terminology 7. Test Specimen
3.1 ultimate critical temperature, (CT), for RCP in a pres- 7.1 The specimen is machined from the compression
surized pipe, the temperature above which RCPis not possible moldedplaqueoftheresin.Theresinmaycomefrompelletsor
at any pressure based on ISO 13477. from sections taken from a pipe.
7.2 The specimen geometry is shown in Fig. 1.
4. Summary of Test Method
7.3 The dimension tolerances are as follows: thickness = 3
4.1 The Charpy specimen is 3 mm thick and taken from a
6 0.2 mm; width = 10 6 0.2 mm; length = 80 6 1 mm; notch
compression-molded plaque of the resin. The specimen is depth = 2.50 6 0.02 mm. The notch is centered within a
notched precisely with a razor blade and tested between 19 °C
distance of 40 6 0.5 mm from the end.
and 27°C.
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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
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Methods. Brown, N. and Lu, X., “Dependence of Rapid Crack Propagation in PE Pipes
Current edition approved Dec. 10, 2002. Published July 2003. on the Plane Stress Fracture Energy of the Resin,”
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Polymer Engineering and Science, Vol 41, 2001, p. 1140.
Annual Book of ASTM Standards, Vol 08.03.
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Annual Book of ASTM Standards, Vol 08.04. Brown, N. and Lu, X., “A Simple Test to Prevent Rapid Crack Propagation,”
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Available from American National Standards Institute (ANSI), 25 W. 43rd St., Plastic Pipes XI, Munich, 2001, p. 583.
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4th Floor, New York, NY 10036. The critical temperature is also related to the dimensions of the pipe.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F2231–02
FIG. 1 Geometry of Impact Specimen
8. Preparation of the Compression Molded Plaque 9.6 Follow Test Method D6110 section 10.2 on Machine
Preparation, and the sections 10.3.2 to 10.3.4 on Specimen
8.1 After the resin is heated to 140 to 160°C, apply and
Testing.
remove the pressure three times. Increase the temperature to
170 to 190°C for 10 to 15 min without pressure. Then apply
10. Test Results
and remove the pressure three times. The specific temperatures
10.1 Test five specimens. Calculate the average value and
that are used depend on the me
...