1、Designation:D487214(Reapproved 2020)Standard Test Method forDielectric Testing of Wire and Cable Filling Compounds1This standard is issued under the fixed designation D4872;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、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 test method covers the determination of dissipationfactor,permittivity(dielectric constant),and ac volume resis-tivity
3、 of wire and cable filling compounds and related materialsthat are solid at room temperature,but capable of being meltedat elevated temperature.1.2 Whenever two sets of values are presented,in differentunits,the values in the first set are the standard,while those inparentheses are for information o
4、nly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.
5、Specific hazard statements are given in Section 7.1.4 This international standard 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
6、the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:23D150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating Materials
7、D1321 Test Method for Needle Penetration of PetroleumWaxesD1711 Terminology Relating to Electrical InsulationD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)43.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Termi
8、nology D1711.4.Summary of Test Method4.1 Place a measured volume of melted sample,free ofentrapped air,into a level preheated specimen dish.Allow thespecimen to cool and place primary and secondary electrodesin uniform contact with the specimen surface.Connect testleads to the specimen dish and the
9、cover plate electrode;makemeasurements to obtain values from which dissipation factor,permittivity,and dc volume resistivity are calculated.5.Significance and Use5.1 Dissipation factor,permittivity,and dc volume resistiv-ity are properties of communication cable fillers and fillercomponents that are
10、 controlled in order that the cableselectrical performance falls within its design limits.Relativelysmall amounts of contaminants,such as polar compounds,water,or salts degrade the cables electrical properties.Limitson the dielectric properties of the cable filling compound areusually specified by t
11、he cable manufacturer,by industrystandards or both.6.Apparatus6.1 Specimen Dish and Cover Electrode,as shown in Fig.1.Use a gold-or nickel-plated specimen dish and cover electrodeplate to ensure a corrosion resistant,high conductivity surface.6.1.1 Clean the specimen dish and electrode plate of oxid
12、a-tion by rinsing in a 5%hydrochloric acid solution for amaximum of 5 s,followed by distilled water,isopropyl alcoholand,finally,by a low boiling petroleum distillate(naphtha)(seeSection 7).Alternatively(preferred),use an ultrasonic cleans-ing bath.Store the dish and cover,wrapped in paper towels,in
13、a desiccator or in an oven maintained at 50C.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Electrical Insulating Materials.Current edition approved Aug.1,2020.Published Augu
14、st 2020.Originallyapproved in 1988.Last previous edition approved in 2014 as D4872 14.DOI:10.1520/D4872-14R20.2For 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 standar
15、ds Document Summary page onthe ASTM website.3For 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.4The last approved ver
16、sion of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organi
