ASTM D2770-93

Standard Specification for Ozone-Resisting Ethylene-Propylene Rubber Integral Insulation and Jacket for Wire and Cable

SCOPE
1.1 This specification covers a weather- and ozoneresisting vulcanized rubber integral insulation and jacket compound for electrical wires and cables. The rubber polymer shall consist substantially of ethylenepropylene copolymer (EPM) or of ethylenepropylene terpolymer (EPDM).  
1.2 This type insulation is considered suitable for use on wire or cable which will be used for continuous operation at conductor temperatures up to 90°C in dry locations and 75°C in wet locations, and at operating voltages not exceeding 2000 V.
1.3 The values stated in inch-pound units, except for temperature, are regarded as the standard. The values in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 09-Sep-2001
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaced By: ASTM D2770-01 - Standard Specification for Ozone-Resisting Ethylene-Propylene Rubber Integral Insulation and Jacket for Wire and Cable (Withdrawn 2007)
• Effective Date: 10-Sep-2001
• Referred By: ASTM F2321-23 - Standard Specification for Flexible and Rigid Insulated Temporary By-Pass Jumpers
• Effective Date: 10-Sep-2001
• Referred By: ASTM F855-23 - Standard Specifications for Temporary Protective Grounds to Be Used on De-energized Electric Power Lines and Equipment
• Effective Date: 10-Sep-2001

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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.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 2770 – 93
Standard Specification for
Ozone-Resisting Ethylene-Propylene Rubber Integral
Insulation and Jacket for Wire and Cable
This standard is issued under the fixed designation D 2770; 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 Physical Test Requirements for EPM or EPDM Integral
1. Scope
Insulation and Jacket
1.1 This specification covers a weather- and ozoneresisting
Physical Requirements (original):
vulcanized rubber integral insulation and jacket compound for
Tensile stress at 100 % elongation, min, psi (MPa) 500 (3.4)
electrical wires and cables. The rubber polymer shall consist Tensile strength, min, psi (MPa) 1200 (8.3)
Elongation at rupture, min, % 150
substantially of ethylenepropylene copolymer (EPM) or of
Physical Requirements [After heat exposure (aging) in
ethylenepropylene terpolymer (EPDM).
an air oven at 121 6 1°C for 168 h]:
1.2 This type insulation is considered suitable for use on
Tensile strength, min, % of original 75
Elongation at rupture, min, % of original 75
wire or cable which will be used for continuous operation at
conductor temperatures up to 90°C in dry locations and 75°C
in wet locations, and at operating voltages not exceeding 2000
V.
tor shall have an insulation resistance not less than that
1.3 The values stated in inch-pound units, except for tem-
corresponding to a constant of 10 000 at 60°F (15.6°C). Where
perature, are regarded as the standard. The values in parenthe-
the temperature of the water in which the insulation is tested
ses are for information only.
differs from 60°F, the measured value obtained shall be
multiplied by the proper correction factor for the particular
2. Referenced Documents
compound as previously determined by the manufacturer.
2.1 ASTM Standards:
4.4 DC Voltage Withstand Test—Upon completion of the
D 470 Test Methods for Crosslinked Insulations and Jackets
insulation resistance test, each length of integrally covered
for Wire and Cable
conductor shall withstand for 5 min the d-c test voltage
specified in Table 2 unless the a-c test described in 4.2 is
3. Physical Properties
performed.
3.1 The crosslinked integral covering shall conform to the
4.5 Accelerated Water Absorption—The integral covering
requirements for physical properties specified in Table 1.
shall meet the requirements of Table 3. The Electrical Method
3.2 Thickness of Insulation—The average thickness of the
Test shall be conducted at 60 Hz with the water temperature at
insulation shall be not less than that given in Table 2. The
75 6 1°C. The water temperature in the Gravimetric Method
minimum thickness shall be not less than 90 % of the specified
Test shall be 706 1°C.
thickness.
5. Ozone Resistance
4. Electrical Requirements
5.1 The integral covering shall show no injury after expo-
4.1 Order of Testing—Perform the ac voltage withstand,
sure for3htoan ozone concentration of between 0.025 and
insulation resistance, and dc voltage withstand tests in that
0.03 % volume.
order when any of these tests are required. The sequence for
other testing is not specified.
6. Sampling
4.2 AC Voltage Withstand Test—Each length of integrally
6.1 Sample the integral insulation and jacket in accordance
covered conductor shall withstand for 5 min the ac voltage
with Test Methods D 470.
specified in Table 2, unless the dc test in 4.4 is performed.
4.3 Insulation Resistance—The integrally cov
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