ASTM F1248-96(2002)e1
(Test Method)Standard Test Method for Determination of Environmental Stress Crack Resistance (ESCR) of Polyethylene Pipe (Withdrawn 2007)
Standard Test Method for Determination of Environmental Stress Crack Resistance (ESCR) of Polyethylene Pipe (Withdrawn 2007)
SCOPE
1.1 This test method covers the determination of a polyethylene pipe specimen's resistance to stress cracking when subjected to compression deformation in the presence of a surface active agent at elevated temperature.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses mathematical conversions to SI units, which are provided for information only and are not considered standard.
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 and health practices and determine the applicability of regulatory limitations prior to use.
WITHDRAWN RATIONALE
This test method covers the determination of a polyethylene pipe specimen's resistance to stress cracking when subjected to compression deformation in the presence of a surface active agent at elevated temperature.
Formerly under the jurisdiction of Committee F17 on , this test method is being balloted for withdrawal with no replacement because slow crack growth resistance standards such as Test Method F 1473 have eliminated the need for the standard.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
e1
Designation: F 1248 – 96 (Reapproved 2002)
Standard Test Method for
Determination of Environmental Stress Crack Resistance
(ESCR) of Polyethylene Pipe
This standard is issued under the fixed designation F 1248; 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.
e NOTE—Section 3.2.2 and Tables 1-3 were editorially revised in November 2002.
1. Scope 3.2.2 failure, n—acrackinthesurfaceofthepipespecimen,
visible with the unaided eye.
1.1 This test method covers the determination of a polyeth-
3.2.2.1 Discussion—Extensionofthecontrollednotchisnot
ylene pipe specimen’s resistance to stress cracking when
a failure. Appearance of more than one crack in a specimen
subjected to compression deformation in the presence of a
shall be classified as a single failure.
surface active agent at elevated temperature.
1.2 The values stated in inch-pound units are to be regarded
4. Summary of Test Method
as the standard. The values given in parentheses mathematical
4.1 A ring specimen of the polyethylene pipe, having a
conversions to SI units, which are provided for information
controlled imperfection at one location, is exposed at an
only and are not considered standard.
elevated temperature to the action of a surface active agent
1.3 This standard does not purport to address all of the
while compressed to deformation between parallel plates. The
safety concerns, if any, associated with its use. It is the
elapsed time in hours to observation of a stress crack failure in
responsibility of the user of this standard to establish appro-
the specimen is recorded.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Significance and Use
5.1 This test method may be used to determine the environ-
2. Referenced Documents
mental stress-crack resistance properties of a polyethylene pipe
2.1 ASTM Standards:
specimen while under high stress in the presence of the
D 1600 Terminology for Abbreviated Terms Relating to
surface-active agent, and at an elevated temperature.
Plastics
D 1693 Test Method for Environmental Stress Cracking of
6. Apparatus
Ethylene Plastics
6.1 Specimen Holder—The test-specimen holder shall con-
F 412 Terminology Relating to Plastic Piping Systems
sist of two parallel plates having a width at least 1.2 times the
nominal outside diameter of the pipe. Fig. 1 shows suggested
3. Terminology
dimensions for a holder for 1 ⁄4-in. pipe. Construction shall be
3.1 Definitions—Definitions of terms are in accordance with
of corrosion-resistant metal such as Type 304 or 316 stainless
Terminology F 412 and abbreviations are in accordance with
steel. The plates shall have a series of appropriately spaced
Terminology D 1600, unless otherwise indicated.
holes through which bolts or threaded rod can be inserted to
3.2 Definitions of Terms Specific to This Standard:
effect compression of the test specimen by the use of nuts. It is
3.2.1 environmental stress crack resistance (ESCR)—a
required that spacers having a thickness equal to the distance
number in units of hours-to-failure indicating the resistance of
requiredforcompressionbeusedtominimizethetimetoeffect
PE pipe to cracking at stresses below the short-term mechani-
compression of the test specimen to ensure consistent and
cal stress values of the pipe while immersed in a surface-active
uniform compression and to prevent overcompression. The
liquid at elevated temperature.
plates shall remain parallel throughout the testing period.
6.2 Notching Jig—The blade used shall be a single-edge
stainless blade (Table 1). The blade shall be replaced after it
This test method is under the jurisdiction of ASTM Committee F17 on Plastic
has been used to produce 20 notches. Additionally, the blade
Piping Systems and is the direct responsibility of Subcommittee F17.40 on Test
Methods.
Current edition approved Sept. 10, 2002. Published May 1996. Originally
published as F 1248 – 89. Last previous edition F 1248 – 96.
2 5
Annual Book of ASTM Standards, Vol 08.01. Ablade made by theAmerican Safety Razor Co., Industrial Products Division,
Annual Book of ASTM Standards, Vol 08.03. Razor Blade Lane,Verona,VA24482, or equivalent, has been found satisfactory for
Annual Book of ASTM Standards, Vol 08.04. this purpose.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
e1
F 1248 – 96 (2002)
FIG. 1 Typical ESCR Fixture for 1 ⁄4-in. IPS Pipe
TABLE 1 Blade Dimensions and Notch Length
NOTE 2—Thecontrolspecimenrequiredin9.4willservetoindicatethe
effectiveness of the reagent.
A
Blade Length, in., Notch Length, in.
Pipe or Tubing Nominal Diameter
+1 16 in.
8. Preparation of Test Specimen
/
1 3
⁄4 –2 ⁄4
8.1 Cutauniformringfromthepipetoawidthof0.5in.(13
1 1
2 ⁄2 –6 1 ⁄2
mm) or 30 % of the nominal outside diameter of the pipe,
10 2 ⁄2
whichever is greater, to a tolerance of +0.125 in. (3 mm) minus
12 3
0.0.
A
Blade Source: American Blade Co.
NOTE 3—Use a tubing cutter with a sharp wheel or some method that
produces smooth cuts. The cutting process should not cause local heating.
shall be inspected before each use employing a 43 magnifying 8.2 Within 1 h prior to testing, cut a controlled sharp notch
glass, and shall be replaced whenever there is question of its
at the thinnest wall section of the specimen. The notch shall be
having become dull or damaged. The required blade holder in the center of the ring with respect to its width and parallel to
design and dimensions are shown in Fig. 2 and Fig. 3.
the edges of the ring. See Fig. 4. The depth of the notch is
6.3 Constant-Temperature Bath—Acovered container filled
dependent on the nominal pipe size and DR and is shown in
with the test reagent and maintained at 122 6 3.6°F (50 6
Table2.Thenotchisproducedbyrollingtheringovertheedge
2°C).Add distilled water as necessary to maintain the specified
of the blade as shown in Fig. 5.
concentration of the test reagent in the bath.The bath and other
components shall be constructed of materials that are not
9. Procedure
attacked by the reagent. Preferred materials of construction are
9.1 Place the ring specimen between the parallel plates of
glass and 304 stainless steel. Specifically barred from the bath
the specimen holder with the notch centered on one side, and
are components made of copper, aluminum, carbon steel, black
compress the specimen until the distance between plates is
iron and zinc.
three times the specified minimum wall thickness as shown in
Table 3. Fig. 6 shows ring specimens in the compressed state.
7. Reagent
(The spacers recommended in 6.1 are not shown.) The notch
7.1 The test reagent shall be a solution of 25 6 5%
shall be in the center of the maximum bend area.
nonylphenoxy poly(ethyleneoxy) ethanol and 75 6 5 % dis-
9.2 Place the specimen holder, with the compressed ring
tilled water by volume.
specimen, into the test reagent 30 6 5 min after initiation of
compression. The instant of immersion is the zero point for
NOTE 1—Store the reagent in closed containers because it is hygro-
determining the time to failure.
scopic.
9.3 Inspectthetestspecimenattimesappropriatetothepipe
compound under test (see Note 4). When the failure of the
specimen is first observed, record whether the failure is in the
This procedure is based on the use of “Igepal CO 630P,’’ a GAF tradename for
notchoroutsideofthenotch.Ifitisoutsideofthenotch,record
nonylphenoxy poly(ethyleneoxy) ethanol. The same chemical from other manufac-
turers is also accept
...
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