1、Designation: D4245 08 (Reapproved 2013)Standard Specification forOzone-Resistant Thermoplastic Elastomer Insulation ForWire and Cable, 90C Dry/75C Wet Operation1This standard is issued under the fixed designation D4245; the number immediately following the designation indicates the year oforiginal a
2、doption 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 insulatingcompound for
3、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 90C in drylocations and 75C in wet locations. Operating voltages are notto exceed
4、2000 V. The minimum installation temperatureis 40C.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 instances the insulati
5、on 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 Documents2.1 ASTM S
6、tandards:2D470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and CableD1711 Terminology Relating to Electrical InsulationD2633 Test Methods for Thermoplastic Insulations andJackets for Wire and Cable3. Terminology3.1 Definitions: For definitions of terms used in this speci-fication re
7、fer to Terminology D1711.3.2 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,Insulation Thicknesses, an
8、d AC Test Voltages for RubberInsulations) of Test Methods D470 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,insulation resistance, an
9、d 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 insulated conductor for
10、5 min at theac withstand voltage given in Table 1A (Conductor Sizes,Insulation Thicknesses, and AC Test Voltages for RubberInsulations) of Test Methods D470 under the columns labeled“Ozone-Resisting Insulation.”5.3 Insulation Resistance5.3.1 The insulated conductor shall have an insulationresistance
11、 value of at least that corresponding to a constant of10 000 at 60F (15.6C).5.3.2 If the water temperature at the time measurement wasmade differs from 60F (15.6C), correct the insulation resis-tance to 60F. Table 2, (Temperature Correction Factors forInsulation Resistance at 60F), of Test Methods D
12、470, containsthe correction factors. Use the procedure given in Test MethodsD470 to determine the 1F coefficient for the insulationmaterial. Multiply the measured value by the correction factorto obtain the insulation resistance value corrected to 60F.5.3.3 If the insulated conductor is covered with
13、 a non-metallic sheath 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.1This specification is under the jurisdiction o
14、f ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Electrical Insulating Materials.Current edition approved Nov. 1, 2013. Published December 2013. Originallyapproved in 1983. Last previous edition approved in 2008 as D4245
15、08. DOI:10.1520/D4245-13.2For referenced ASTM 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.*A Summary of Changes section appear
16、s at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.4 DC Voltage Withstand TestUnless otherwise specified,omit this test if the ac voltage withstand test described in 5.2has been performed. After completion
17、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 D470under the columns labeled “Ozone-Resisting Insulations.”6. Cold Bend6.1 The insulation shall not
18、show any cracks when tested ata temperature of 55C in accordance with the procedure andTable number 7 (Mandrel Diameters for Cold Bend Test) inTest Methods D470.7. Ozone7.1 The insulation shall show no cracking or surface check-ing visible to the unaided eye after exposure to an ozoneconcentration o
19、f not less than 0.025 nor more than 0.030 % byvolume, when tested in accordance with Test Methods D470.8. Heat Distortion8.1 The insulation shall meet the requirements in Table 1when tested in accordance with the procedure in MethodsD2633.9. Accelerated Water Absorption9.1 The insulated conductor sh
20、all meet the requirements inTable 2 when tested in accordance with the procedure in TestMethods D470. Conduct the electrical method test at 60 Hzwith the water temperature at 75 6 1C.10. Sampling10.1 Unless otherwise instructed, sample the insulation inaccordance with Test Methods D470.11. Test Meth
21、ods11.1 Unless otherwise instructed, test the insulation inaccordance with Test Methods D470.12. Keywords12.1 accelerated water absorption; ac voltage test; dc volt-age test; insulation; insulation resistance; 90C dry/75C wetinsulation; ozone-resistant; thermoplastic elastomer; thermo-plastic elasto
22、mer insulationSUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this specification since the last issue,D4245 02, that may impact the use of this specification. (Approved November 1, 2008)(1) Revised Sections 4 and 5.ASTM International takes no position respecting th
23、e 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 rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard i
24、s 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 for revision of this standard or for additional standardsand should be addressed to ASTM International He
25、adquarters. 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 hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This s
26、tandard 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 may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or
27、 serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Requirements for Physical PropertiesUnaged Requirements:Tensi
28、le strength, min, psi (MPa) 1000 (6.9)Elongation at rupture, min, % 300Aged Requirements:After air-oven test at 1211Cfor168h:Tensile strength and elongation at rupture, min, % ofunaged value75Heat Distortion (At 150 1C, max, % of unaged value):4/0 AWG (107 mm2) and smaller (insulation on cable) 50La
29、rger 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 0.5D4245 08 (2013)2
