1、Designation:D300408(Reapproved 2020)Standard Specification forCrosslinked and Thermoplastic Extruded Semi-Conducting,Conductor,and Insulation Shielding Materials1This standard is issued under the fixed designation D3004;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.Scope1.1 This specification covers crosslinked and thermoplasticextruded semi-conduct
3、ing,conductor,and insulation shieldingmaterials for electrical wires and cables.1.2 In many instances,the electrical properties of theshielding material are strongly dependent on processing con-ditions.For this reason,in this specification the material issampled from cable.Therefore,tests are done o
4、n shielded wirein this standard solely to determine the relevant property of theshielding material and not to test the conductor or completedcable.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This international standar
5、d was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenc
6、ed Documents2.1 ASTM Standards:2D257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD1711 Terminology Relating to Electrical InsulationD2647 Specification for Crosslinkable Ethylene PlasticsD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compound
7、s and PreparingStandard Vulcanized SheetsD3183 Practice for RubberPreparation of Pieces for TestPurposes from ProductsD4496 Test Method for D-C Resistance or Conductance ofModerately Conductive MaterialsD4703 Practice for Compression Molding ThermoplasticMaterials into Test Specimens,Plaques,or Shee
8、tsD6095 Test Method for Longitudinal Measurement of Vol-ume Resistivity for Extruded Crosslinked and Thermo-plastic Semiconducting Conductor and Insulation Shield-ing Materials3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification,referto Terminology D1711.3.2 Definit
9、ions of Terms Specific to This Standard:3.2.1 aging(act of),nthe exposure of materials to anenvironment for an interval of time.3.2.2 longitudinal volume resistivity,nan electrical resis-tance multiplied by a factor calculated from the geometry of aspecimen volume between electrodes in contact with
10、one,andonly one,surface of the specimen.3.2.2.1 DiscussionIn normal wire and cable usage,thelongitudinal volume resistivity is simply referred to as“volumeresistivity.”This usage is at variance with terminology in TestMethods D257,D4496,and Terminology D1711.3.2.3 semi-conducting,adjmoderately condu
11、ctive;seeTerminology D1711 and Test Method D4496.4.Physical Properties4.1 The shielding material,when processed into moldedslabs,in accordance with Procedure C in the annex of PracticeD4703,the Sampling section of Specification D2647,andPractices D3182 and D3183,depending on the type of materialbein
12、g tested,shall conform to the requirements for physicalproperties specified in Table 1.5.Electrical Requirements5.1 Logitudinal Volume ResistivityWhen the extrudedconductor and insulation shielding is sampled and tested inaccordance with Test Method D6095,the volume resistivity atthe rated temperatu
13、re of the insulation shall be not greater than100 000 cm for conductor shielding and 50 000 cm forinsulation shielding.1This specification is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Electr
14、ical Insulating Materials.Current edition approved Aug.1,2020.Published September 2020.Originallyapproved in 1971.Last previous edition approved in 2013 as D3004 08(2013).DOI:10.1520/D3004-08R20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at ser
15、viceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with in
16、ternationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.Sampling6.1 Sample the semi-conducting materials in accordancewith 4.1.7.Test Methods7.1 Test the semi-conducting materials in accordance with4.1 and Test Method D6095.8.Keywords8.1 conductor shielding material;insulation shielding mate-rial;semi
