ASTM F2136-08(2015)
(Test Method)Standard Test Method for Notched, Constant Ligament-Stress (NCLS) Test to Determine Slow-Crack-Growth Resistance of HDPE Resins or HDPE Corrugated Pipe
Standard Test Method for Notched, Constant Ligament-Stress (NCLS) Test to Determine Slow-Crack-Growth Resistance of HDPE Resins or HDPE Corrugated Pipe
SIGNIFICANCE AND USE
4.1 This test method does not purport to interpret the data generated.
4.2 This test method is intended to compare slow-crack-growth (SCG) resistance for a limited set of HDPE resins.
4.3 This test method may be used on virgin HDPE resin compression-molded into a plaque or on extruded HDPE corrugated pipe that is chopped and compression-molded into a plaque (see 7.1.1 for details).
SCOPE
1.1 This test method is used to determine the susceptibility of high-density polyethylene (HDPE) resins or corrugated pipe to slow-crack-growth under a constant ligament-stress in an accelerating environment. This test method is intended to apply only to HDPE of a limited melt index and density range as defined in AASHTO Standard Specification M 294. This test method may be applicable for other materials, but data are not available for other materials at this time.
1.2 This test method measures the failure time associated with a given test specimen at a constant, specified, ligament-stress level.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.4 Definitions are in accordance with Terminology AASHTO Standard Specification M 294, and abbreviations are in accordance with Terminology D1600, unless otherwise specified.
1.5 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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Designation: F2136 − 08 (Reapproved 2015)
Standard Test Method for
Notched, Constant Ligament-Stress (NCLS) Test to
Determine Slow-Crack-Growth Resistance of HDPE Resins
or HDPE Corrugated Pipe
This standard is issued under the fixed designation F2136; 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 D1822 Test Method for Tensile-Impact Energy to Break
Plastics and Electrical Insulating Materials
1.1 This test method is used to determine the susceptibility
D4703 Practice for Compression Molding Thermoplastic
of high-density polyethylene (HDPE) resins or corrugated pipe
Materials into Test Specimens, Plaques, or Sheets
to slow-crack-growth under a constant ligament-stress in an
D5397 Test Method for Evaluation of Stress Crack Resis-
acceleratingenvironment.Thistestmethodisintendedtoapply
tance of Polyolefin Geomembranes Using Notched Con-
only to HDPE of a limited melt index and density range as
stant Tensile Load Test
defined in AASHTO Standard Specification M 294. This test
E4 Practices for Force Verification of Testing Machines
method may be applicable for other materials, but data are not
E691 Practice for Conducting an Interlaboratory Study to
available for other materials at this time.
Determine the Precision of a Test Method
1.2 This test method measures the failure time associated
F412 Terminology Relating to Plastic Piping Systems
with a given test specimen at a constant, specified, ligament-
2.2 Other Document:
stress level.
AASHTO Standard Specification M 294
1.3 The values stated in inch-pound units are to be regarded
3. Summary of Test Method
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.1 This test method subjects a dumbbell-shaped, notched
and are not considered standard.
test-specimen (Fig. 1) to a constant ligament-stress in the
presence of a surface-active agent at an elevated temperature.
1.4 Definitions are in accordance with Terminology
It differs from Test Method D5397 in that a constant ligament
AASHTO Standard Specification M 294, and abbreviations are
stress is used instead of a constant tensile load.
in accordance with Terminology D1600, unless otherwise
specified.
4. Significance and Use
1.5 This standard does not purport to address all of the
4.1 This test method does not purport to interpret the data
safety concerns, if any, associated with its use. It is the
generated.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.2 This test method is intended to compare slow-crack-
bility of regulatory limitations prior to use.
growth (SCG) resistance for a limited set of HDPE resins.
4.3 This test method may be used on virgin HDPE resin
2. Referenced Documents
compression-molded into a plaque or on extruded HDPE
2.1 ASTM Standards:
corrugated pipe that is chopped and compression-molded into
D1600 Terminology forAbbreviatedTerms Relating to Plas-
a plaque (see 7.1.1 for details).
tics
5. Apparatus
1 5.1 Blanking Die—Adie suitable for cutting test specimens.
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 Acceptable dies are: the type L die per Test Method D1822,
Methods.
with holes drilled or punched in the tab areas after die cutting;
Current edition approved Dec. 1, 2015. Published December 2015. Originally
a die with the dimensions and tolerances specified in Fig. 2.
approved in 2001. Last previous edition approved in 2008 as F2136–08 DOI:
10.1520/F2136-08R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Association of State Highway and Transportation
Standards volume information, refer to the standard’s Document Summary page on Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
the ASTM website. http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2136 − 08 (2015)
T = thickness.
W = specimen width.
NOTE 1—The test specimen is intended to have the same geometry used forTest Method D5397 specimens.The length of the specimen can be changed
to suit the design of the test apparatus. However, there should be a constant neck section with length at least 0.5 in. (13 mm) long.
NOTE2—Itispreferabletomodifythespecimendiesothattheattachmentholesarepunchedoutatthesametimeasthespecimenratherthanpunching
or machining them into the specimen at a later time. If the attachment holes are introduced at a later time, it is extremely important that they be carefully
aligned so as to avoid adding a twisting component to the stress being placed on the specimen.
FIG. 1 Notching Position
5.2 Stress-Crack Testing Apparatus—A lever loading procedure and type of apparatus used. The approximate thick-
machine, with a lever arm ratio of 2:1 to 5:1 similar to that ness of the blade should be 0.2 to 0.3 mm.
described inTest MethodD5397.Alternatively, the tensile load
NOTE 1—Around robin was conducted to determine the effect of types
may be applied directly using dead weights or any other
of blades on the notch depth. In this study, several types of steel blades
methodforproducingaconstantligamentstress.Determinethe
(single-edge, double-edge, and so forth) from various manufacturers were
zero-load offset and lever-arm ratio for each test station, using used by the round-robin participants. The round robin consisted of seven
laboratories using two types of resins molded into plaques. The standard
a force standard that complies with Practices E4. The load on
deviation of the test results within laboratories is less than 610 %.
the specimen shall be accurate to 0.5 % of the calculated or
5.4 Micrometer, capable of measuring to 60.001 in.
applied load. The bath solution temperature shall be set at 122
(60.025 mm).
6 2°F (50 6 1°C).
5.3 Notching Device—Notch depth is an important variable 5.5 Microscope, equipped with micrometer or an equivalent
that must be controlled. Paragraph 7.2.1 describes the notching device capable of accurately measuring the notch depth.
F2136 − 08 (2015)
a plaque as previously stated. If different materials are used for
the inner and outer wall of dual wall pipe, each wall must be
tested separately.
7.1.2 Die cut test specimens from the sheet, and make holes
in the specimen as shown in Fig. 1.
7.1.3 Specimen tolerances are as follows:
Length = 2.36 ± 0.01 in. (60.00 ± 0.25 mm)
Width = 0.125 ± 0.001 in. (3.20 ± 0.02 mm)
Thickness = 0.075 ± 0.003 in. (1.90 ± 0.08 mm)
7.2 Notching:
7.2.1 Notch specimens across the center of the 0.125-in.
(3.20-mm) wide, 0.500-in. (12.7-mm) long reduced section as
shown in Figs. 1 and 2. Cut the notch perpendicular to the
plane defined by specimen length and width, and align at a
right angle to the direction of load application. Cut the notch at
a maximum rate of 0.1 in./min (2.5 mm/min) to a depth of
a 5 0.20 3T (1)
where:
NOTE 1—Dimensions are in inches with tolerance of 60.005 in., except
a = notch depth, and
specimen width, which has a tolerance of 60.001 in.
T = measured thickness of the specimen.
FIG. 2 Specimen Geometry—Test Specimen Dimensions
Control notch depth to 60.001 in. (60.025 mm) by mea-
suring the notch depth with a microscope.
7.2.2 No single razor blade shall be used for more than ten
5.6 Compression-Molding Press and Suitable Chase for
test specimens.
Compression-MoldingtheSpecimens,inaccordancewithPrac-
7.3 Calculation of Test Load:
tice D4703.
7.3.1 For each specimen, measure the reduced section width
5.7 Metal Shot, for weight tubes.
(W), thickness (T), and notch depth (a) to the nearest 0.001 in.
5.8 Ele
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F2136 − 08 F2136 − 08 (Reapproved 2015) An American National Standard
Standard Test Method for
Notched, Constant Ligament-Stress (NCLS) Test to
Determine Slow-Crack-Growth Resistance of HDPE Resins
or HDPE Corrugated Pipe
This standard is issued under the fixed designation F2136; 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
1.1 This test method is used to determine the susceptibility of high-density polyethylene (HDPE) resins or corrugated pipe to
slow-crack-growth under a constant ligament-stress in an accelerating environment. This test method is intended to apply only to
HDPE of a limited melt index and density range as defined in AASHTO Standard Specification M 294. This test method may be
applicable for other materials, but data are not available for other materials at this time.
1.2 This test method measures the failure time associated with a given test specimen at a constant, specified, ligament-stress
level.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 Definitions are in accordance with Terminology AASHTO Standard Specification M 294, and abbreviations are in
accordance with Terminology D1600, unless otherwise specified.
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D1600 Terminology for Abbreviated Terms Relating to Plastics
D1822 Test Method for Tensile-Impact Energy to Break Plastics and Electrical Insulating Materials
D4703 Practice for Compression Molding Thermoplastic Materials into Test Specimens, Plaques, or Sheets
D5397 Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile
Load Test
E4 Practices for Force Verification of Testing Machines
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
F412 Terminology Relating to Plastic Piping Systems
2.2 Other Document:
AASHTO Standard Specification M 294
3. Summary of Test Method
3.1 This test method subjects a dumbbell-shaped, notched test-specimen (Fig. 1) to a constant ligament-stress in the presence
of a surface-active agent at an elevated temperature. It differs from Test Method D5397 in that a constant ligament stress is used
instead of a constant tensile load.
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 Methods.
Current edition approved Nov. 1, 2008Dec. 1, 2015. Published November 2008 December 2015. Originally approved in 2001. Last previous edition approved in 20052008
as F2136–05F2136–08 DOI: 10.1520/F2136-08.10.1520/F2136-08R15.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from American Association of State Highway and Transportation Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F2136 − 08 (2015)
T = thickness.
W = specimen width.
NOTE 1—The test specimen is intended to have the same geometry used for Test Method D5397 specimens. The length of the specimen can be changed
to suit the design of the test apparatus. However, there should be a constant neck section with length at least 0.5 in. (13 mm) long.
NOTE 2—It is preferable to modify the specimen die so that the attachment holes are punched out at the same time as the specimen rather than punching
or machining them into the specimen at a later time. If the attachment holes are introduced at a later time, it is extremely important that they be carefully
aligned so as to avoid adding a twisting component to the stress being placed on the specimen.
FIG. 1 Notching Position
4. Significance and Use
4.1 This test method does not purport to interpret the data generated.
4.2 This test method is intended to compare slow-crack-growth (SCG) resistance for a limited set of HDPE resins.
4.3 This test method may be used on virgin HDPE resin compression-molded into a plaque or on extruded HDPE corrugated
pipe that is chopped and compression-molded into a plaque (see 7.1.1 for details).
5. Apparatus
5.1 Blanking Die—A die suitable for cutting test specimens. Acceptable dies are: the type L die per Test Method D1822, with
holes drilled or punched in the tab areas after die cutting; a die with the dimensions and tolerances specified in Fig. 2.
5.2 Stress-Crack Testing Apparatus—A lever loading machine, with a lever arm ratio of 2:1 to 5:1 similar to that described in
Test Method D5397. Alternatively, the tensile load may be applied directly using dead weights or any other method for producing
F2136 − 08 (2015)
NOTE 1—Dimensions are in inches with tolerance of 60.005 in., except specimen width, which has a tolerance of 60.001 in.
FIG. 2 Specimen Geometry—Test Specimen Dimensions
a constant ligament stress. Determine the zero-load offset and lever-arm ratio for each test station, using a force standard that
complies with Practices E4. The load on the specimen shall be accurate to 0.5 % of the calculated or applied load. The bath solution
temperature shall be set at 122 6 2°F (50 6 1°C).
5.3 Notching Device—Notch depth is an important variable that must be controlled. Paragraph 7.2.1 describes the notching
procedure and type of apparatus used. The approximate thickness of the blade should be 0.2 to 0.3 mm.
NOTE 1—A round robin was conducted to determine the effect of types of blades on the notch depth. In this study, several types of steel blades
(single-edge, double-edge, and so forth) from various manufacturers were used by the round-robin participants. The round robin consisted of seven
laboratories using two types of resins molded into plaques. The standard deviation of the test results within laboratories is less than 610 %.
5.4 Micrometer, capable of measuring to 60.001 in. (60.025 mm).
5.5 Microscope, equipped with micrometer or an equivalent device capable of accurately measuring the notch depth.
5.6 Compression-Molding Press and Suitable Chase for Compression-Molding the Specimens, in accordance with Practice
D4703.
5.7 Metal Shot, for weight tubes.
5.8 Electronic Scale, for measuring shot weight tubes capable of measuring to 60.1 g.
5.9 Timing Device, capable of recording failure time to the nearest 0.1 h.
6. Reagents
6.1 The stress-cracking reagent shall consist of 10 % nonylphenoxy poly (ethyleneoxy) ethanol by volume in 90 % deionized
water. The solution level is to be checked daily and deionized water used to keep the bath at a constant level.
7. Procedure
7.1 Specimen Preparation:
7.1.1 Compression-mold pellet specimens (virgin resin) or chopped pipe into 0.075-in. (1.9-mm) sheet in accordance with
Procedure C of Practice D4703, except that the pellets do not have to be roll-milled prior to being compression-molded. The rate
of cooling shall be 27 +/- 3.6°F (15 6 2°C) per minute. If desired, the sheet may be trimmed by 0.6 in. (15 mm) on each side in
order to avoid any edge effects. Since pipes have extrusion-induced orientation that can significantly affect the test results, it is
necessary to remove the orientation effect by molding into a plaque. Chop and mold a pipe specimen in accordance with
...
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