1、Designation:D 4247 99An American National StandardStandard Specification forGeneral-Purpose,Black Heavy-Duty,and Black Extra-Heavy-Duty Crosslinked Polychloroprene Jackets for Wire andCable1This standard is issued under the fixed designation D 4247;the number immediately following the designation in
2、dicates the year 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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers crosslinked polychlo
3、roprenecompounds suitable for use as outer coverings or jackets onelectrical cables for general-purpose,black heavy-duty andblack extra-heavy-duty service.1.2 These jackets are not recommended for installation at atemperature lower than 25C.1.3 Whenever two sets of values are presented,in differentu
4、nits,the values in the first set are the standard,while those inparentheses are for information only.2.Referenced Documents2.1 ASTM Standards:D 470 Test Methods for Crosslinked Insulations and Jacketsfor Wire and Cable2D 1711 Terminology Relating to Electrical Insulation23.Terminology3.1 Definitions
5、For definitions of terms used in this speci-fication refer to Terminology D 1711.3.2 Definitions of Terms Specific to This Standard:3.2.1 aging(act of),nexposure of materials to air at100C for 168 h or oil at 121C for 18 h.4.Physical Properties4.1 The jacket shall conform to the requirements for phy
6、si-cal properties prescribed in Table 1.5.Sampling5.1 Sample the jacket in accordance with Test MethodsD 470.6.Test Methods6.1 Test the jacket in accordance with Test Methods D 470.7.Keywords7.1 crosslinked jacket;extra-heavy-duty jacket;general-purpose jacket;heavy-duty jacket;polychloroprene jacke
7、t;rubber jacket1This specification is under the jurisdiction of ASTM Committee D-9 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.18 on Solid Insulations,Nonmetallic Shieldings,and Coveringsfor Electrical and Telecommunications Wires and Cables.C
8、urrent edition approved April 10,1999.Published June 1999.Originallypublished as D 4247 83.Last previous edition D 4247 95.2Annual Book of ASTM Standards,Vol 10.01.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.The American Society for T
9、esting and Materials takes no position respecting the validity of any patent rights asserted in connectionwith any item mentioned in this standard.Users of this standard are expressly advised that determination of the validity of any suchpatent rights,and the risk of infringement of such rights,are
10、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 for revision of this standard or for additional standardsa
11、nd should be addressed to ASTM Headquarters.Your comments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.If you feel that your comments have not received a fair hearing you should make yourviews known to the ASTM Committee on Standards,at t
12、he address shown below.This standard is copyrighted byASTM,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.Individual reprints(single or multiple copies)of this standard may be obtained by contacting ASTM at the above address or at610-832-9585(phone),610-832-9555(fax),
13、or serviceastm.org(e-mail);or through the ASTM website(www.astm.org).TABLE 1 Physical PropertiesAPhysical PropertyGeneral-PurposeHeavy-DutyExtra-Heavy-DutyUnaged Requirements:Tensile strength,min,psi(MPa)1500(10.3)1800(12.4)2400(16.5)Tensile stress at 200%elongation,min,psi(MPa).500(3.4)700(4.8)Elon
14、gation at rupture,min,%250300300Tension setB,max,%303030Tear,min,lbf/in.(kN/m).40(7)Aged Requirements:After air-oven test at 100 6 1C for 168 h:Tensile strength,min,%of unaged value505050Elongation at rupture,min,%of unaged value505050After oil-immersion test at 121 6 1C for 18 h:Tensile strength,min,%of unaged value606060Elongation at rupture,min,%of unaged value606060AValues specified are applicable only to jackets having a nominal wall thickness of 0.030 in.(0.76 mm)or greater.BSet in 2-in.(50-mm)gage length.D 42472