ASTM D4245-97

Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90&#176C Dry/75&#176C Wet Operation

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 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 cable.

General Information

• Status: Historical
• Publication Date: 09-Mar-2002
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaced By: ASTM D4245-02 - Standard Specification for Ozone-Resistant Thermoplastic Elastomer Insulation For Wire and Cable, 90&#176C Dry/75&#176C Wet Operation
• Effective Date: 10-Mar-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4245 – 97 An American National Standard
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 D 4245; 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 (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Requirements for Physical Properties
1. Scope
Unaged Requirements:
1.1 This specification covers an ozone-resistant insulating
Tensile strength, min, psi (MPa) 1000 (6.9)
compound for electrical wire and cables 14 AWG and larger.
Elongation at rupture, min, % 300
Aged Requirements:
This compound consists substantially of a thermoplastic elas-
After air-oven test at 121 6 1°C for 168 h:
tomer.
Tensile strength and elongation at rupture, min, % of 75
1.2 This type of insulation is suitable for continuous opera-
unaged value
tion at conductor temperatures not exceeding 90°C in dry Heat Distortion (At 150 6 1°C, max, % of unaged value):
4/0 AWG (107 mm ) and smaller (insulation on cable) 50
locations and 75°C in wet locations. Operating voltages are not
Larger than 4/0 AWG (107 mm ) (buffed sample of 50
to exceed 2000 V. The minimum installation temperature
insulation)
is −40°C.
1.3 The values stated in inch-pound units are the standard,
Insulations) of Test Methods D 470 lists the minimum average
except in cases where SI units are more appropriate. The values
thickness for the insulation. The required minimum thickness
in parentheses are for information only.
is 90 % of the specified average thickness.
1.4 In many instances the insulation cannot be tested unless
it has been formed around a conductor or cable. Therefore,
5. Electrical Requirements
tests are done on insulated wire or cable in this document
5.1 Order of Testing—Perform the ac voltage test, insulation
solely to determine the relevant property of the insulation and
resistance, and dc voltage tests in that order when any of these
not to test the conductor or completed cable.
tests are specified. The sequence of other testing is not
specified.
2. Referenced Documents
5.2 AC Voltage Test—Unless otherwise specified, omit this
2.1 ASTM Standards:
test if the dc voltage test described in 5.4 is to be performed.
D 470 Test Methods for Crosslinked Insulations and Jackets
Test each insulated conductor for 5 min at the ac withstand
for Wire and Cable
voltage given in Table 1(a) (Conductor Sizes, Insulation
D 2633 Methods of Testing Thermoplastic Insulations and
Thicknesses, and AC Test Voltages for Rubber Insulations) of
Jackets for Wire and Cable
Test Methods D 470 under the columns labelled “Ozone-
Resisting Insulation.”
3. Terminology
5.3 Insulation Resistance
3.1 Definitions of Terms Specific to This Standard:
5.3.1 The insulated conductor shall have an insulation
3.1.1 aging, n—exposure of materials to air at 121°C for
resistance value if at least that corresponding to a constant of
168 h.
10 000 at 60°F (15.6°C).
5.3.2 If the water temperature at the time measurement was
4. Physical Properties
made differs from 60°F (15.6°C), correct the insulation resis-
4.1 Requirements for physical properties are listed in Table
tance to 60°F. Table 2, (Temperature Correction Factors for
1.
Insulation Resistance at 60°F), of Test Methods D 470, con-
4.2 Thickness of Insulation—Table 1(a) (Conductor Sizes,
tains the correction factors. Each insulation manufacturer can
Insulation Thicknesses, and AC Test Voltages for Rubber
furnish the 1°F coefficient for the insulation material by using
the procedure given in Test Methods D 470. Multiply the
measured value by the correction factor to obtain the insulation
This specification is under the jurisdiction of ASTM Committee D-9 on
resistance value corrected to 60°F.
Electrical and Electronic Insulating Materials and is the direct respons
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