ASTM D4246-14

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Designation: D4246 − 02 (Reapproved 2010) D4246 − 14
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
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Wire and Cable, 90 °C 90°C Operation
This standard is issued under the fixed designation D4246; 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 Scope*
1.1 This specification covers an ozone-resistant insulating compound for electrical wire and cables 14 AWG and larger. This
compound consists substantially of a thermoplastic elastomer.
1.2 This type of insulation is considered suitable for continuous operation at conductor temperatures not exceeding 90 °C 90°C
in dry locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature is −40 °C.is -40°C.
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.
1.4 In many instances the insulation material cannot be tested unless it has been formed around a conductor or cable. Therefore,
tests are done on insulated wire or cable in this specification solely to determine the relevant property of the insulation material
and not to test the conductor or completed cable.
2. Referenced Documents
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2.1 ASTM Standards:
D470 Test Methods for Crosslinked Insulations and Jackets for Wire and Cable
D1711 Terminology Relating to Electrical Insulation
D2633 Test Methods for Thermoplastic Insulations and Jackets for Wire and Cable
3. Terminology
3.1 Definitions: Definitions—For definitions of terms used in this specification refer to Terminology D1711.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aging (act of), n—the exposure of materials to air at 121 °C 121°C for 168 h.
4. Physical Properties
4.1 Requirements for physical properties are listed in Table 1.
4.2 Thickness of Insulation—Table 1(a), (Conductor Sizes, Insulation Thicknesses, and AC Test Voltages for Rubber
Insulations) of Test Methods D470 lists the minimum average thickness for the insulation. The required minimum thickness is
90 % of the specified average thickness.
5. Electrical Requirements
5.1 Order of Testing—Perform the ac voltage, insulation resistance, and dc voltage tests in that order when any of these tests
are specified. The sequence of other testing is not specified.
5.2 AC Voltage Test—Unless otherwise specified, omit this test if the dc voltage test described in 5.4 is to be performed. Test
each insulated conductor for 5 min at the ac voltage given in Table 1(a) (Conductor Sizes, Insulation Thicknesses, and AC Test
Voltages, for Rubber Insulations) of Methods D470, under the columns labelledlabeled “Ozone-Resisting Insulations.”
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This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.18 on Solid Insulations, Non-Metallic Shieldings and Coverings for Electrical and Telecommunication Wires and Cables.
Current edition approved March 1, 2010Nov. 1, 2014. Published August 2010November 2014. Originally approved in 1983. Last previous edition approved in 20022010
as D4246D4246 – 02 (2010).–02. DOI: 10.1520/D4246-02R10.10.1520/D4246-14.
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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.
*A Summary of Changes section appears at the end of this standard
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D4246 − 14
TABLE 1 Requirements for Physical Properties
Unaged Requirements:
Tensile strength, min, psi (MPa) 1000 (6.9)
Elongation at rupture, min, % 300
Aged Requirements
(after air oven test at
121 ± 1 °C for 168 h):
Aged Requirements
(after air oven test at
121 ± 1°C for 168 h):
Tensile strength and elongation, at rupture min, % of 75
unaged value
Heat Distortion (at 150 ± 1 °C, max, % of unaged value):
Heat Distortion (at 150 ± 1°C, max, % of unaged value):
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4/0 AWG (107 m ) and smaller (insulation on cable) 50
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Larger than 4/0 AWG (107 mm ) (buffed sample of 50
insulation)
2
Larger than 4/0 AWG (107 mm ) (buffed, p
...