ASTM D2951-00

Standard Test Method for Resistance of Types III and IV Polyethylene Plastics to Thermal Stress-Cracking (Withdrawn 2006)

SCOPE
1.1 This test method covers determination of the susceptibility of Types III and IV polyethylene plastics (as defined in the table on Classification of Polyethylene Plastics Molding and Extrusion Materials According to Type, in Specification D1248) to thermal stress-cracking.
Note 1--It has also been found useful in testing specimens from fabricated items such as pipe or conduit.
1.2 The values stated in SI units are to be regarded as the standard, except in cases where materials, products, or equipment are available only in inch-pound units. The values in parentheses are given for information only.  
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. Specific precautionary statements are given in Note 7.
Note 2--There is no similar or equivalent ISO standard.
WITHDRAWN RATIONALE
This test method covered determination of the susceptibility of Types III and IV polyethylene plastics (as defined in the table on Classification of Polyethylene Plastics Molding and Extrusion Materials According to Type, in Specification D 1248) to thermal stress-cracking.
Formerly under the jurisdiction of Committee D20 on Plastics, this test method was withdrawn in May 2006 due to its limited use in industry.

General Information

• Status: Withdrawn
• Publication Date: 09-Jul-2000
• Withdrawal Date: 26-Jun-2006
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Referred By: ASTM D4020-18 - Standard Specification for Ultra-High-Molecular-Weight Polyethylene Molding and Extrusion Materials
• Effective Date: 10-Jul-2000
• Referred By: ASTM D4976-12a(2020) - Standard Specification for Polyethylene Plastics Molding and Extrusion Materials
• Effective Date: 10-Jul-2000
• Referred By: ASTM D1248-16 - Standard Specification for Polyethylene Plastics Extrusion Materials for Wire and Cable
• Effective Date: 10-Jul-2000
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Jul-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation:D2951–00
Standard Test Method for
Resistance of Types III and IV Polyethylene Plastics to
Thermal Stress-Cracking
This standard is issued under the fixed designation D 2951; 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.
1. Scope* 3. Terminology
1.1 This test method covers determination of the suscepti- 3.1 Definitions:
bility of Types III and IV polyethylene plastics (as defined in 3.1.1 For definitions of terms see Terminology D 883.
the table on Classification of Polyethylene Plastics Molding
4. Summary of Test Method
and Extrusion Materials According to Type, in Specification
D 1248) to thermal stress-cracking. 4.1 Strips of material 127 by 6.4 by 1.3 mm (5.0 by 0.25 by
0.050 in.) are cut from a molded test sheet. The strips are
NOTE 1—It has also been found useful in testing specimens from
helically wrapped and fastened to a 6.4-mm (0.25-in.) diameter
fabricated items such as pipe or conduit.
metal rod. The assembly is then placed in the specified test
1.2 The values stated in SI units are to be regarded as the
environment. The specimens are examined at the end of
standard, except in cases where materials, products, or equip-
specified time intervals and the cumulative number of those
ment are available only in inch-pound units. The values in
which have failed is recorded for each time interval.
parentheses are given for information only.
1.3 This standard does not purport to address all of the 5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 Resistance to thermal stress-cracking is a property that
responsibility of the user of this standard to establish appro-
isofimportanceinmaterialusedforjacketingandinsulationof
priate safety and health practices and determine the applica-
wire and cable.
bility of regulatory limitations prior to use. Specific precau-
5.2 As a general correlation between test results and field
tionary statements are given in Note 7.
performance has been recognized, this test may be considered
3, 4
suitable for specification acceptance.
NOTE 2—There is no similar or equivalent ISO standard.
5.3 Some polyethylenes embrittle or crack if they are
2. Referenced Documents
exposed to elevated temperatures. This embrittlement may
resultinseverecracking,especiallyifthepolymersarestressed
2.1 ASTM Standards:
A 276 Specification for Stainless Steel Bars and Shapes duringexposure.Thephenomenacausingthermal-stresscrack-
ing are not clearly understood. It is evident that either increas-
D 618 Practice for Conditioning Plastics and Electrical
Insulating Materials for Testing ing the density or decreasing the molecular weight has a
detrimental effect on the resistance to thermal-stress cracking.
D 883 Terminology Relating to Plastics
D 1248 SpecificationforPolyethylenePlasticsMoldingand 5.4 This is a pass or fail test, not intended for arranging
various Type III and IV polyethylene plastics in a series.
Extrusion Materials
D 4703 Practice for Compression Molding Thermoplastic
6. Apparatus
Materials into Test Specimens, Plaques, or Sheets
6.1 Blanking Die, with a rectangular opening, 127 by 6.4
E 145 Specification for Gravity-Convection and Forced-
mm (5.0 by 0.25 in.). The cutting edges shall be sharp and free
Ventilation Ovens
of nicks so that clean cuts are made.
6.2 Leather Punch, Drill or Equivalent, capable of produc-
ing clean holes approximately 1.6 mm ( ⁄16 in.) in diameter.
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-
als.
Current edition approved July 10, 2000. Published September 2000. Originally Heiss, J. H., and Lanza, V. L., Wire and Wire Products, Vol 33, pp 1182–87
published as D 2951 – 71. Last current edition D 2951 – 95. (1958).
2 4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Heiss, J. H., Lanza, V. L., and Martin, W. M., Wire and Wire Products,pp
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM 592–593, pp 626–627, May 1959. ASTM Round Robin, RR:D20–1000.
Standards volume information, refer to the standard’s Document Summary page on Round-robin data for this test method may be obtained fromASTM Headquar-
the ASTM website. ters. Request RR:D20-1008.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2951–00
6.3 Specimen Mandrels—Stainless steel or brass rods, 6.40 Punchtwoholesnominally1.6mm( ⁄16in.)indiameterineach
6 0.05 mm (0.25 6 0.002 in.) in diameter by 165 mm (6.5 in.) specimen 3.2 mm (0.125 in.) from each end.
long with three pairs of 1.6-mm ( ⁄16-in.) diameter holes spaced
8.3 Conditioning—Condition the test specimens at 23 6
34.9 mm (1.375 in.) apart (center-to-center) and each pair
2 C (73.4 6 3.6 F) and 50 6 % relative humidity for not less
separated from adjacent pairs by 12.7 mm (0.50 in.). The holes
than 40 h prior to test in accordance with Procedure A of
in the mandrel must be parallel. See Fig. 1.
Practice D 618 for those tests where conditioning is required.
In cases of disagreement, the tole
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