1、Designation: D 4245 08An American National StandardStandard Specification forOzone-Resistant Thermoplastic Elastomer Insulation ForWire and Cable, 90 C Dry/75 C Wet Operation1This standard is issued under the fixed designation D 4245; the number immediately following the designation indicates the ye
2、ar oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers an ozone-resistant insulati
3、ngcompound for electrical wire and cables 14 AWG and larger.This compound consists substantially of a thermoplastic elas-tomer.1.2 This type of insulation is suitable for continuous opera-tion at conductor temperatures not exceeding 90 C in drylocations and 75 C in wet locations. Operating voltages
4、arenot to exceed 2000 V. The minimum installation temperatureis 40 C.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 In many inst
5、ances the insulation material cannot betested unless it has been formed around a conductor or cable.Therefore, tests are done on insulated wire or cable in thisdocument solely to determine the relevant property of theinsulation material and not to test the conductor or completedcable.2. Referenced D
6、ocuments2.1 ASTM Standards:2D 470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD 1711 Terminology Relating to Electrical InsulationD 2633 Test Methods for Thermoplastic Insulations andJackets for Wire and Cable3. Terminology3.1 Definitions: For definitions of terms used in t
7、his speci-fication refer to Terminology D 1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging, nexposure of materials to air at 121 C for168 h.4. Physical Properties4.1 Requirements for physical properties are listed in Table1.4.2 Thickness of InsulationTable 1A (Conductor Sizes,Insu
8、lation Thicknesses, and AC Test Voltages for RubberInsulations) of Test Methods D 470 lists the minimum averagethickness for the insulation. The required minimum thicknessis 90 % of the specified average thickness.5. Electrical Requirements5.1 Order of TestingPerform the ac voltage withstand test,in
9、sulation resistance, and dc voltage withstand test in that orderwhen any of these tests are specified. The sequence of othertesting is not specified.5.2 AC Voltage Withstand TestUnless otherwise specified,omit this test if the dc voltage withstand test described in 5.4 isto be performed. Test each i
10、nsulated conductor for 5 min at theac withstand voltage given in Table 1A (Conductor Sizes,Insulation Thicknesses, and AC Test Voltages for RubberInsulations) of Test Methods D 470 under the columns labeled“Ozone-Resisting Insulation.”5.3 Insulation Resistance5.3.1 The insulated conductor shall have
11、 an insulationresistance value of at least that corresponding to a constant of10 000 at 60 F (15.6 C).5.3.2 If the water temperature at the time measurement wasmade differs from 60 F (15.6 C), correct the insulationresistance to 60 F. Table 2, (Temperature Correction Factorsfor Insulation Resistance
12、 at 60 F), of Test Methods D 470,contains the correction factors. Use the procedure given in TestMethods D 470 to determine the 1 F coefficient for the1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility
13、 ofSubcommittee D09.18 on Solid Insulations, Non-Metallic Shieldings and Coveringsfor Electrical and Telecommunication Wires and Cables.Current edition approved Nov. 1, 2008. Published December 2008. Originallyapproved in 1983. Last previous edition approved in 2002 as D 4245 02.2For referenced ASTM
14、 standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM
15、 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.insulation material. Multiply the measured value by the cor-rection factor to obtain the insulation resistance value correctedto 60 F.5.3.3 If the insulated conductor is covered with a non-metallic sh
16、eath so that the insulation resistance can be mea-sured only on the completed assembly, the required insulationresistance shall be not less than 60 % of that required for theprimary insulation based on the thickness of that insulation.5.4 DC Voltage Withstand TestUnless otherwise specified,omit this
17、 test if the ac voltage withstand test described in 5.2has been performed. After completion of the insulation resis-tance test, test each insulated conductor for 5 min at the dcwithstand voltage given in Table 1B (Conductor Sizes, and DCTest Voltages for Rubber Insulations) of Test Methods D 470unde
18、r the columns labeled “Ozone-Resisting Insulations.”6. Cold Bend6.1 The insulation shall not show any cracks when tested ata temperature of 55 C in accordance with the procedure andTable number 7 (Mandrel Diameters for Cold Bend Test) inTest Methods D 470.7. Ozone7.1 The insulation shall show no cra
19、cking or surface check-ing visible to the unaided eye after exposure to an ozoneconcentration of not less than 0.025 nor more than 0.030 % byvolume, when tested in accordance with Test Methods D 470.8. Heat Distortion8.1 The insulation shall meet the requirements in Table 1when tested in accordance
20、with the procedure in MethodsD 2633.9. Accelerated Water Absorption9.1 The insulated conductor shall meet the requirements inTable 2 when tested in accordance with the procedure in TestMethods D 470. Conduct the electrical method test at 60 Hzwith the water temperature at 75 6 1 C.10. Sampling10.1 U
21、nless otherwise instructed, sample the insulation inaccordance with Test Methods D 470.11. Test Methods11.1 Unless otherwise instructed, test the insulation inaccordance with Test Methods D 470.12. Keywords12.1 accelerated water absorption; ac voltage test; dc volt-age test; insulation; insulation r
22、esistance; 90 C dry/75 C wetinsulation; ozone-resistant; thermoplastic elastomer; thermo-plastic elastomer insulationSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the last issue,D 4245 02, that may impact the use of this specification. (A
23、pproved November 1, 2008)(1) Revised Sections 4 and 5.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent r
24、ights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either f
25、or revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair heari
26、ng you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard m
27、ay be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Requirements for Physical PropertiesUnaged Requirements:Tensile strength, min, psi (MPa) 1000 (6.9)Elongation at ruptur
28、e, min, % 300Aged Requirements:After air-oven test at 121 6 1 C for 168 h:Tensile strength and elongation at rupture, min, % ofunaged value75Heat Distortion (At 150 6 1 C, max, % of unaged value):4/0 AWG (107 mm2) and smaller (insulation on cable) 50Larger than 4/0 AWG (107 mm2) (buffed sample ofinsulation)50TABLE 2 Accelerated Water Absorption Test RequirementsElectrical Method:Permittivity after 1 day, max 6.0Increase in capacitance, max, %:From 1 to 14 daysFrom 7 to 14 days5.03.0Stability factor after 14 days, max 1.0Alternative, stability factor difference:1 to 14 days, max 0.5D4245082
