ASTM F1473-07
(Test Method)Standard Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins
Standard Test Method for Notch Tensile Test to Measure the Resistance to Slow Crack Growth of Polyethylene Pipes and Resins
SIGNIFICANCE AND USE
This test method is useful to measure the slow crack growth resistance of molded plaques of polyethylene materials at accelerated conditions such as 80°C, 2.4-MPa stress, and with a sharp notch.
The time to failure depends on the following test parameters: temperature; stress; notch depth; and specimen geometry. Increasing temperature, stress, and notch depth decrease the time to failure. Thus, in reporting the time to failure, all the conditions of the test must be specified.
SCOPE
1.1 This test method determines the resistance of polyethylene materials to slow crack growth under conditions specified within.Note 1
This test method is known as PENT (Pennsylvania Notch Test) test.
1.2 The test is generally performed at 80C and at 2.4 MPa, but may also be done at temperatures below 80C and with other stresses low enough to preclude ductile failure and thereby eventually induce brittle type of failure. Generally, polyethylenes will ultimately fail in a brittle manner by slow crack growth at 80C if the stress is below 2.4 MPa.
1.3 The test method is for specimens cut from compression molded plaques. See Appendix X1 for information relating to specimens from pipe.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation:F1473–07
Standard Test Method for
Notch Tensile Test to Measure the Resistance to Slow Crack
1
Growth of Polyethylene Pipes and Resins
This standard is issued under the fixed designation F1473; 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 D4703 Practice for Compression Molding Thermoplastic
Materials into Test Specimens, Plaques, or Sheets
1.1 This test method determines the resistance of polyeth-
F412 Terminology Relating to Plastic Piping Systems
ylene materials to slow crack growth under conditions speci-
fied within.
3. Terminology
NOTE 1—This test method is known as PENT (Pennsylvania Notch
3.1 Definitions:
Test) test.
3.1.1 Definitions are in accordance with Terminology F412.
1.2 The test is generally performed at 80°C and at 2.4 MPa,
Abbreviations are in accordance with Terminology D1600,
but may also be done at temperatures below 80°C and with
unless otherwise indicated.
other stresses low enough to preclude ductile failure and
3.1.2 brittle failure—a pipe failure mode which exhibits no
thereby eventually induce brittle type of failure. Generally,
visible (to the naked eye) permanent material deformation
polyethylenes will ultimately fail in a brittle manner by slow
(stretching, elongation, or necking down) in the area of the
crack growth at 80°C if the stress is below 2.4 MPa.
break (Terminology F412).
1.3 The test method is for specimens cut from compression
3.2 Definitions of Terms Specific to This Standard:
2
molded plaques. SeeAppendix X1 for information relating to
3.2.1 slow crack growth—the slow extension of the crack
specimens from pipe.
with time.
1.4 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 Specimens are cut from compression molded plaques. It
priate safety and health practices and determine the applica- is precisely notched and then exposed to a constant tensile
bility of regulatory limitations prior to use. stress at elevated temperatures in air. The time for complete
failure is recorded.
2. Referenced Documents
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5. Significance and Use
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
5.1 This test method is useful to measure the slow crack
D1600 Terminology for Abbreviated Terms Relating to growth resistance of molded plaques of polyethylene materials
Plastics
at accelerated conditions such as 80°C, 2.4-MPa stress, and
D3350 Specification for Polyethylene Plastics Pipe and with a sharp notch.
Fittings Materials
5.2 The time to failure depends on the following test
parameters: temperature; stress; notch depth; and specimen
geometry. Increasing temperature, stress, and notch depth
decrease the time to failure. Thus, in reporting the time to
1
This test method is under the jurisdiction of ASTM Committee F17 on Plastic
failure, all the conditions of the test must be specified.
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test
Methods.
Current edition approved May 1, 2007. Published May 2007. Originally 6. Apparatus
´1
approved in 1997. Last previous edition approved in 2001 as F1473 – 01 . DOI:
6.1 Lever Loading Machine, with a lever arm ratio of about
10.1520/F1473-07.
2
5:1. The tensile load may also be applied directly using dead
Lu, X., and Brown, N., “ATest for Slow Crack Growth Failure in Polyethylene
Under a Constant Load,” Journal of Polymer Testing, Vol 11, pp. 309–319, 1992.
weightsoranyothermethodforproducingaconstantload.The
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
pull rods on the grips shall have universal action to prevent
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
bending. The grips shall be serrated to prevent slippage. The
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. load on the specimen shall be accurate to at least 60.5 %.
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F1473–07
6.2 Furnace, heated by ordinary incandescent light bulbs
covered with aluminum foil or any other suitable heating
element.
6.3 Temperature Controller, shall be able to control the
temperature within 60.5°C with respect to the set point.
6.4 Temperature-Measuring Device, a thermometer or a
thermocouple which can measure the temperature with an
accuracy better than 0.5°C.
6.5 Timer, shal
...
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