ASTM D4246-14
(Specification)Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90°C Operation
Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90°C Operation
ABSTRACT
This specification covers an ozone-resistant thermoplastic elastomer insulation for electrical wire and cables. This type of insulation is considered to be suitable for continuous operation at the specified conductor temperatures and operating voltages in dry locations. The minimum installation temperature is specified. Tests shall be done on insulated wire or cable solely to determine the relevant property of the insulation material and not to test the conductor or completed cable. The insulation shall conform to the prescribed physical property requirements such as (1) tensile strength and elongation at rupture before and after air oven aging test, (2) heat distortion, and (3) thickness. AC voltage, insulation resistance, and DC voltage tests shall be performed in that order when any of these tests are specified for electrical requirements. The insulation shall not show any cracks when tested by cold bend test and shall show no cracking or surface checking after exposure to the prescribed ozone concentration.
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 in dry locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature 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.
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Designation:D4246 −14
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
1
Wire and Cable, 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* 3.2.1 aging (act of), n—the exposure of materials to air at
121°C for 168 h.
1.1 This specification covers an ozone-resistant insulating
compound for electrical wire and cables 14 AWG and larger.
4. Physical Properties
This compound consists substantially of a thermoplastic elas-
tomer.
4.1 Requirements for physical properties are listed in Table
1.
1.2 This type of insulation is considered suitable for con-
tinuous operation at conductor temperatures not exceeding
4.2 Thickness of Insulation—Table 1(a), (Conductor Sizes,
90°C in dry locations. Operating voltages are not to exceed
Insulation Thicknesses, and AC Test Voltages for Rubber
2000 V. The minimum installation temperature is -40°C.
Insulations) of Test Methods D470 lists the minimum average
1.3 Whenever two sets of values are presented, in different thickness for the insulation. The required minimum thickness
units, the values in the first set are the standard, while those in is 90 % of the specified average thickness.
parentheses are for information only.
5. Electrical Requirements
1.4 In many instances the insulation material cannot be
tested unless it has been formed around a conductor or cable.
5.1 Order of Testing—Perform the ac voltage, insulation
Therefore, tests are done on insulated wire or cable in this
resistance, and dc voltage tests in that order when any of these
specification solely to determine the relevant property of the
tests are specified. The sequence of other testing is not
insulation material and not to test the conductor or completed
specified.
cable.
5.2 AC Voltage Test—Unless otherwise specified, omit this
test if the dc voltage test described in 5.4 is to be performed.
2. Referenced Documents
Test each insulated conductor for 5 min at the ac voltage given
2
2.1 ASTM Standards:
in Table 1(a) (Conductor Sizes, Insulation Thicknesses, and
D470 Test Methods for Crosslinked Insulations and Jackets
AC Test Voltages, for Rubber Insulations) of Methods D470,
for Wire and Cable
under the columns labeled “Ozone-Resisting Insulations.”
D1711 Terminology Relating to Electrical Insulation
D2633 Test Methods for Thermoplastic Insulations and
5.3 Insulation Resistance—The insulated conductor shall
Jackets for Wire and Cable have an insulation resistance value of at least that correspond-
ing to a constant of 10 000 at 60°F (15.6°C).
3. Terminology
5.3.1 If the water temperature at the time measurement was
3.1 Definitions—For definitions of terms used in this speci-
made differs from 60°F (15.6°C), correct the insulation resis-
fication refer to Terminology D1711. tance to 60°F. Table 2 (Temperature Correction Factors for
Insulation Resistance at 60°F) of Test Methods D470 contains
3.2 Definitions of Terms Specific to This Standard:
the correction factors. Each insulation manufacturer can fur-
nish the 1°F coefficient for the insulation material by using the
1
procedure given in Test Methods D470. Multiply the measured
This specification is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
valuebythecorrectionfactortoobtaintheinsulationresistance
Subcommittee D09.07 on Electrical Insulating Materials.
value corrected to 60°F.
Current edition approved Nov. 1, 2014. Published November 2014. Originally
5.3.2 If the insulated conductor is covered with a non-
approved in 1983. Last previous edition approved in 2010 as D4246 – 02 (2010).
DOI: 10.1520/D4246-14.
metallic sheath so that the insulation resistance can be mea-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sured only on the completed assembly, the required insulation
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
resistance shall be at least 60 % of that required for the primary
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. insulation based on the thickness of that insulation.
*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
1
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D4246−14
TABLE 1 Requirements for Physical Properties
7. Ozone
Unaged Requirements:
7.1 The insulation shall show no cracking or surface check-
...
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: D4246 − 02 (Reapproved 2010) D4246 − 14
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
1
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
2
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.”
1
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.
2
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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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):
2
4/0 AWG (107 m ) and smaller (insulation on cable) 50
2
Larger than 4/0 AWG (107 mm ) (buffed sample of 50
insulation)
2
Larger than 4/0 AWG (107 mm ) (buffed, p
...
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