ASTM D2308-07

Standard Specification for Thermoplastic Polyethylene Jacket for Electrical Wire and Cable

ABSTRACT
This specification covers a thermoplastic jacketing compound substantially consisting of pigmented polyethylene for use in electrical wires and cables with specified nominal thicknesses and operating at specified voltages. Since the jacket material cannot be tested unless it has been formed around a conductor or cable, tests shall then be done on jacketed wires and cables solely to determine the relevant property of the jacket material and not to test the jacketed conductor or completed cable. Materials shall be suitably sampled and tested, and shall conform accordingly to the following physical and electrical properties: unaged tensile strength and elongation at rupture; tensile strength and elongation at rupture after air oven aging; absorption coefficient; heat distortion; environmental stress-cracking; surface resistivity; and U-bend discharge.
SCOPE
1.1 This specification covers a thermoplastic jacketing compound for 2 to 35 kV wire and cable, of at least 0.030 in. (0.76 mm) nominal thickness, consisting substantially of pigmented polyethylene.
1.2 In many instances the jacket material cannot be tested unless it has been formed around a conductor or cable. Therefore, tests done on jacketed wire and cable in this specification are solely to determine the relevant property of the jacket material and not to test the jacketed conductor or completed cable.
1.3 Whenever two sets of values are presented, in different units, the values in the first set are the standard, while those in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 30-Apr-2007
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaces: ASTM D2308-02 - Standard Specification for Thermoplastic Polyethylene Jacket for Electrical Wire and Cable
• Effective Date: 01-May-2007
• Referred By: ASTM D1351-20 - Standard Specification for Thermoplastic Polyethylene Insulation for Electrical Wire and Cable
• Effective Date: 01-May-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2308 −07 AnAmerican National Standard
Standard Specification for
Thermoplastic Polyethylene Jacket for Electrical Wire and
1
Cable
This standard is issued under the fixed designation D2308; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.2 Definitions of Terms Specific to This Standard:
3.2.1 aging, (act of), n—exposure of materials to air at 100
1.1 Thisspecificationcoversathermoplasticjacketingcom-
°C for either 24 or 48 h.
pound for 2 to 35 kVwire and cable, of at least 0.030 in. (0.76
mm) nominal thickness, consisting substantially of pigmented
4. Physical Properties
polyethylene.
4.1 The polyethylene before application to the wire or cable
1.2 In many instances the jacket material cannot be tested
shall comply with the requirements for Type I, Class C,
unless it has been formed around a conductor or cable.
Category 4 or 5, Grade E5 or J3 of Specification D1248,or
Therefore, tests done on jacketed wire and cable in this
Class B with equivalent weathering requirements to Class C
specification are solely to determine the relevant property of
materials. The requirements of Specification D1248 shall not
the jacket material and not to test the jacketed conductor or
apply to the jacket removed from the wire or cable. The
completed cable.
compound is suitable for exposure to sunlight and other
atmospheric environments at temperatures between −55
1.3 Whenever two sets of values are presented, in different
and+75 °C, and a minimum installation temperature of−40
units, the values in the first set are the standard, while those in
°C.
parentheses are for information only.
4.2 Specimensremovedfromthewireorcableandtestedat
2. Referenced Documents
20to28°C(68to82°F)shallconformtotherequirementsfor
2
2.1 ASTM Standards: physical properties specified in Table 1. Alternatively, the
D1248Specification for Polyethylene Plastics Extrusion
jacket shall be air-oven aged without removal from the
Materials for Wire and Cable conductor.
D1693Test Method for Environmental Stress-Cracking of
4.3 Environmental Stress-Cracking Test—The jacket shall
Ethylene Plastics
conform to the requirements for Grade E5 as specified in
D1711Terminology Relating to Electrical Insulation
Table3 of Specification D1248.
D2633Test Methods for Thermoplastic Insulations and
4.4 Absorption Coeffıcient —See Test Method D3349.
Jackets for Wire and Cable
Instead of testing the jacket removed from the conductors, a
D3349Test Method for Absorption Coefficient of Ethylene
certification by the polyethylene compound manufacturer that
Polymer Material Pigmented with Carbon Black
this requirement has been complied with shall suffice.
3. Terminology
5. Electrical Properties
3.1 Definitions:
5.1 The polyethylene jacket shall conform to the require-
3.1.1 Refer to Terminology D1711 for definitions of terms
ments for electrical properties specified in Table 2.
used in this specification.
6. Sampling
6.1 Unless otherwise instructed, sample the jacket in accor-
1
This specification is under the jurisdiction of ASTM Committee D09 on
dance with Test Methods D2633.
Electrical and Electronic Insulating Materials and is the direct responsibility of
SubcommitteeD09.18onSolidInsulations,Non-MetallicShieldingsandCoverings
7. Test Methods
for Electrical and Telecommunication Wires and Cables.
Current edition approved May 1, 2007. Published June 2007. Originally
7.1 Unless otherwise instructed, test the jacket in accor-
approved in 1964. Last previous edition approved in 2002 as D2308–02. DOI:
dance with Test Methods D2633.
10.1520/D2308-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.2 Environmental Stress-Cracking Test—Test in accor-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
dance with Test Method D1693, Condition A, using undiluted
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Igepal CO 630 as specified in Specification D1248.
*A Summary of Changes section appears at the end of this standard
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D2308−07
TABLE 1 Physical Properties
8.2 If any specimen fails to pass these tests, the length of
Unaged Requirements: cable from which the specimen was taken shall be considered
Tensile Strength, min, psi (MPa) 1400 (9.7)
as not meeting the requirements of this specification. Retest
Elongation at Rupture, min, % 350
new specimens from each of two other lengths of cable from
Aged Requirements:
...