ASTM D4245-21
(Specification)Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90 °C Dry/75 °C Wet Operation
Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90 °C Dry/75 °C Wet Operation
ABSTRACT
This specification covers ozone-resistant thermoplastic elastomer insulation for electrical wires and cables operating continuously at specified conductor temperatures, within the specified voltage range, and under wet or dry conditions. The prescribed tests cannot be performed unless the insulation is formed around a conductor, but these are done solely to determine the insulation properties and not to test the conductor or completed cable. Each test sample should be subjected to ac and dc voltage withstand tests as well as insulation resistance tests and should comply with the required values for aging, heat distortion, electrical permittivity, increase in capacitance, stability factor, and accelerated water absorption.
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 suitable for continuous operation at conductor temperatures not exceeding 90 °C in dry locations and 75 °C in wet locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature is −40 °C.
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 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 document solely to determine the relevant property of the insulation material and not to test the conductor or completed cable.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Dec-2020
- Technical Committee
- D09 - Electrical and Electronic Insulating Materials
- Drafting Committee
- D09.07 - Electrical Insulating Materials
Relations
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Nov-2015
- Effective Date
- 01-Nov-2014
- Effective Date
- 01-May-2014
- Effective Date
- 01-Nov-2013
- Effective Date
- 01-Aug-2011
- Effective Date
- 01-May-2008
- Refers
ASTM D470-05 - Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable - Effective Date
- 01-Sep-2005
- Effective Date
- 10-Mar-2002
- Effective Date
- 10-Oct-1999
- Refers
ASTM D470-99 - Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable - Effective Date
- 10-Mar-1999
Overview
ASTM D4245-21 is the international standard specification that defines the requirements for ozone-resistant thermoplastic elastomer insulation on electrical wire and cables. This standard, developed by ASTM International, addresses the performance and testing of insulating materials used for conductors operating continuously at temperatures up to 90 °C in dry locations and 75 °C in wet locations. Specifically designed for wire sizes 14 AWG and larger with voltages not exceeding 2000 V, the specification ensures reliable insulation performance under both wet and dry environmental conditions, including exposure to ozone and extreme temperatures.
Key Topics
Material Requirements
- Specifies the use of thermoplastic elastomer as the primary insulating compound.
- Ensures insulation is ozone-resistant and maintains integrity when exposed to environmental stressors.
Operational Conditions
- Suitable for continuous operation at conductor temperatures up to 90 °C (dry) and 75 °C (wet).
- Insulation can be installed at temperatures as low as −40 °C.
Physical and Electrical Properties
- Insulated material must meet defined criteria for tensile strength, elongation, and heat deformation.
- Electrical properties tested include ac/dc voltage withstand and insulation resistance.
Testing and Compliance
- Insulation properties are determined by forming the compound around a conductor before testing.
- Tests cover aging, heat distortion (deformation), electrical permittivity, capacitance increase, stability factor, and accelerated water absorption.
- Cold bend and ozone exposure tests ensure insulation does not crack or degrade under tough conditions.
Applications
ASTM D4245-21 is used in the manufacturing and quality assurance of insulated wire and cable products across various industries. Its main applications include:
Industrial Electrical Wiring
Wire and cable in factories, power plants, and process facilities require insulation capable of withstanding ozone exposure, temperature variations, and moisture ingress.Commercial and Utility Installations
Buildings, data centers, and utility networks use cables that must meet stringent performance and safety criteria for continuous and reliable service.Harsh Environment Solutions
Suitable for applications where cables may be exposed to ozone, high humidity, or fluctuating temperatures, such as outdoor utilities, marine environments, and transit systems.
By adhering to this standard, manufacturers and users ensure the durability, reliability, and safety of thermoplastic elastomer insulated cables even under challenging field conditions.
Related Standards
ASTM D470: Test Methods for Crosslinked Insulations and Jackets for Wire and Cable
Provides essential testing procedures referenced in ASTM D4245-21 for physical and electrical property evaluation.ASTM D1711: Terminology Relating to Electrical Insulation
Defines key terms and concepts used within the scope of electrical insulation standards.ASTM D2633: Test Methods for Thermoplastic Insulations and Jackets for Wire and Cable
Offers detailed methods for assessing physical properties and performance of thermoplastic cable insulation.
Practical Value
Implementing ASTM D4245-21 helps ensure electrical safety, extended product life, and compliance with international quality standards. By specifying ozone-resistant and temperature-tolerant materials, this standard supports applications where electrical reliability is critical. Manufacturers, engineers, and specifiers benefit from clear criteria for performance and testing, reducing the risk of failure and enhancing overall system integrity in diverse operating environments.
Keywords: ASTM D4245-21, ozone-resistant insulation, thermoplastic elastomer insulation, wire and cable standards, 90 °C dry, 75 °C wet, electrical insulation, ac voltage withstand, dc voltage withstand, insulation resistance, accelerated water absorption testing, ASTM cable specifications.
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ASTM D4245-21 - Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90 °C Dry/75 °C Wet Operation
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Frequently Asked Questions
ASTM D4245-21 is a technical specification published by ASTM International. Its full title is "Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90 °C Dry/75 °C Wet Operation". This standard covers: ABSTRACT This specification covers ozone-resistant thermoplastic elastomer insulation for electrical wires and cables operating continuously at specified conductor temperatures, within the specified voltage range, and under wet or dry conditions. The prescribed tests cannot be performed unless the insulation is formed around a conductor, but these are done solely to determine the insulation properties and not to test the conductor or completed cable. Each test sample should be subjected to ac and dc voltage withstand tests as well as insulation resistance tests and should comply with the required values for aging, heat distortion, electrical permittivity, increase in capacitance, stability factor, and accelerated water absorption. 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 suitable for continuous operation at conductor temperatures not exceeding 90 °C in dry locations and 75 °C in wet locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature is −40 °C. 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 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 document solely to determine the relevant property of the insulation material and not to test the conductor or completed cable. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ABSTRACT This specification covers ozone-resistant thermoplastic elastomer insulation for electrical wires and cables operating continuously at specified conductor temperatures, within the specified voltage range, and under wet or dry conditions. The prescribed tests cannot be performed unless the insulation is formed around a conductor, but these are done solely to determine the insulation properties and not to test the conductor or completed cable. Each test sample should be subjected to ac and dc voltage withstand tests as well as insulation resistance tests and should comply with the required values for aging, heat distortion, electrical permittivity, increase in capacitance, stability factor, and accelerated water absorption. 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 suitable for continuous operation at conductor temperatures not exceeding 90 °C in dry locations and 75 °C in wet locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature is −40 °C. 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 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 document solely to determine the relevant property of the insulation material and not to test the conductor or completed cable. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D4245-21 is classified under the following ICS (International Classification for Standards) categories: 29.035.20 - Plastics and rubber insulating materials. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D4245-21 has the following relationships with other standards: It is inter standard links to ASTM D1711-24, ASTM D1711-15, ASTM D1711-14a, ASTM D1711-14, ASTM D1711-13, ASTM D1711-11a, ASTM D1711-08, ASTM D470-05, ASTM D1711-02, ASTM D1711-99, ASTM D470-99. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D4245-21 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D4245 −21
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
Wire and Cable, 90 °C Dry/75 °C Wet Operation
This standard is issued under the fixed designation D4245; 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* D1711Terminology Relating to Electrical Insulation
D2633Test Methods for Thermoplastic Insulations and
1.1 This specification covers an ozone-resistant insulating
Jackets for Wire and Cable
compound for electrical wire and cables 14 AWG and larger.
This compound consists substantially of a thermoplastic elas-
3. Terminology
tomer.
3.1 Definitions:
1.2 This type of insulation is suitable for continuous opera-
3.1.1 For definitions of terms used in this specification refer
tion at conductor temperatures not exceeding 90°C in dry
to Terminology D1711.
locations and 75 °C in wet locations. Operating voltages are
3.2 Definitions of Terms Specific to This Standard:
not to exceed 2000 V. The minimum installation temperature
3.2.1 aging, n—exposure of materials to air at 121 °C for
is−40 °C.
168 h.
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
4. Physical Properties
conversions to SI units that are provided for information only
4.1 Requirements for physical properties are listed in Table
and are not considered standard.
1.
1.4 In many instances the insulation material cannot be
4.2 Thickness of Insulation—Table 1A (Conductor Sizes,
tested unless it has been formed around a conductor or cable.
Insulation Thicknesses, and AC Test Voltages for Rubber
Therefore, tests are done on insulated wire or cable in this
Insulations) of Test Methods D470 lists the minimum average
document solely to determine the relevant property of the
thickness for the insulation. The required minimum thickness
insulation material and not to test the conductor or completed
is 90% of the specified average thickness.
cable.
1.5 This international standard was developed in accor-
5. Electrical Requirements
dance with internationally recognized principles on standard-
5.1 Order of Testing—Performtheacvoltagewithstandtest,
ization established in the Decision on Principles for the
insulationresistance,anddcvoltagewithstandtestinthatorder
Development of International Standards, Guides and Recom-
when any of these tests are specified. The sequence of other
mendations issued by the World Trade Organization Technical
testing is not specified.
Barriers to Trade (TBT) Committee.
5.2 AC Voltage Withstand Test—Unless otherwise specified,
2. Referenced Documents omitthistestifthedcvoltagewithstandtestdescribedin5.4is
to be performed.Test each insulated conductor for 5 min at the
2.1 ASTM Standards:
ac withstand voltage given in Table 1A (Conductor Sizes,
D470Test Methods for Crosslinked Insulations and Jackets
Insulation Thicknesses, and AC Test Voltages for Rubber
for Wire and Cable
Insulations) of Test Methods D470 under the columns labeled
“Ozone-Resisting Insulation.”
This specification is under the jurisdiction of ASTM Committee D09 on
5.3 Insulation Resistance
Electrical and Electronic Insulating Materials and is the direct responsibility of
5.3.1 The insulated conductor shall have an insulation
Subcommittee D09.07 on Electrical Insulating Materials.
resistance value of at least that corresponding to a constant of
Current edition approved Jan. 1, 2021. Published February 2021. Originally
10 000 at 60 °F (15.6 °C).
approved in 1983. Last previous edition approved in 2013 as D4245–08 (2013).
DOI: 10.1520/D4245-21.
5.3.2 If the water temperature at the time measurement was
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
made differs from 60 °F (15.6 °C), correct the insulation
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
resistance to 60 °F. Table 2, (Temperature Correction Factors
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. for Insulation Resistance at 60 °F), of Test Methods D470,
*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
D4245 − 21
TABLE 1
...
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: D4245 − 08 (Reapproved 2013) D4245 − 21
Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
Wire and Cable, 90°C Dry/75°C 90 °C Dry/75 °C Wet
Operation
This standard is issued under the fixed designation D4245; 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 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 suitable for continuous operation at conductor temperatures not exceeding 90°C90 °C in dry locations
and 75°C 75 °C in wet locations. Operating voltages are not to exceed 2000 V. The minimum installation temperature
is −40°C.is −40 °C.
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 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 document solely to determine the relevant property of the insulation material and
not to test the conductor or completed cable.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
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: For definitions of terms used in this specification refer to Terminology D1711.
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.07 on Electrical Insulating Materials.
Current edition approved Nov. 1, 2013Jan. 1, 2021. Published December 2013February 2021. Originally approved in 1983. Last previous edition approved in 20082013
as D4245 – 08.D4245 – 08 (2013). DOI: 10.1520/D4245-13.10.1520/D4245-21.
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
D4245 − 21
3.1 Definitions:
3.1.1 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, n—exposure of materials to air at 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 1A (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 withstand test, insulation resistance, and dc voltage withstand test in that order when
any of these tests are specified. The sequence of other testing is not specified.
5.2 AC Voltage Withstand Test—Unless otherwise specified, omit this test if the dc voltage withstand test described in 5.4 is to be
performed. Test each insulated conductor for 5 min at the ac withstand voltage given in Table 1A (Conductor Sizes, Insulation
Thicknesses, and AC Test Voltages for Rubber Insulations) of Test Methods D470 under the columns labeled “Ozone-Resisting
Insulation.”
5.3 Insulation Resistance
5.3.1 The insulated conductor shall have an insulation resistance value of at least that corresponding to a constant of 10 000 at
60°F (15.6°C).60 °F (15.6 °C).
5.3.2 If the water temperature at the time measurement was made differs from 60°F (15.6°C), 60 °F (15.6 °C), correct the
insulation resistance to 60°F. 60 °F. Table 2, (Temperature Correction Factors for Insulation Resistance at 60°F), 60 °F), of Test
Meth
...
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