Standard Specification for
Ozone-Resistant Thermoplastic Elastomer Insulation For
Wire and Cable, 90°C Dry/75°C Wet Operation1
This standard is issued under the fixed designation D 4245; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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.
1.1 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
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
document solely to determine the relevant property of the
insulation material and not to test the conductor or completed
2. Referenced Documents
2.1 ASTM Standards:
D 470 Test Methods for Crosslinked Insulations and Jackets
for Wire and Cable2
D 1711 Terminology Relating to Electrical Insulation2
D 2633 Methods of Testing Thermoplastic Insulations and
Jackets for Wire and Cable3
3.1 Definitions: For definitions of terms used in this specification refer to Terminology D 1711.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 aging, n—exposure of materials to air at 121°C for
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