ASTM_D_2149_-_13_2021.pdf

Designation:D214913(Reapproved 2021)Standard Test Method forPermittivity(Dielectric Constant)and Dissipation Factor ofSolid Dielectrics at Frequencies to 10 MHz andTemperatures to 500 C1This standard is issued under the fixed designation D2149;the number immediately following the designation indicates 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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the relativepermittivity(dielectric constant)and dissipation factor of soliddielectrics from 50 Hz to 10 MHz over a range of temperaturesfrom 80 to 500 C.2,3Two procedures are included as follows:1.1.1 Procedure AUsing Micrometer Electrode.1.1.2 Procedure BUsing Precision Capacitor.NOTE1In common usage the word“relative”is frequently dropped.1.2 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.1.3 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 the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:4D150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD1711 Terminology Relating to Electrical InsulationE197 Specification for Enclosures and Servicing Units forTests Above and Below Room Temperature(Withdrawn1981)53.Terminology3.1 Definitions:3.1.1 Permittivity and dissipation factor are fully defined inTerminology D1711.Briefly,the permittivity of an insulatingmaterial is the ratio of the capacitance between two conductorswhen embedded in the material to the capacitance between thesame configuration of conductors in a vacuum(or air).Thedissipation factor is the ratio of the resistive to capacitivecurrents in the dielectric.The product of the permittivity anddissipation factor is the loss index.4.Significance and Use4.1 Permittivity and dissipation factor are sensitive tochanges in chemical composition,impurities,and homogene-ity.Measurement of these properties is,therefore,useful forquality control and for determining the effect of environmentssuch as moisture,heat,or radiation.5.Apparatus5.1 Measuring CircuitsSuitable measuring circuits aredescribed in Test Methods D150.For measurements from50 Hz to 100 kHz a substitution method using a low-voltagecapacitance bridge is recommended.For measurements at1 MHz and above,a resonant-circuit susceptance variationmethod is recommended.The Q of the circuit has to be at least200 except for very low loss materials,for which a Q of 500 orhigher is desirable.5.2 TestEnclosureUnlesstestingonlyatroomtemperature,it is necessary to adapt a Hartshorn-Ward typespecimen holder to a temperature-controlled test enclosure.Where applicable,use the requirements for a gradeAenclosureas in Specification E197.A suggested arrangement is shown inFig.1.This arrangement provides terminal connections awayfrom the temperature zone.1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved March 1,2021.Published May 2021.Originallyapproved in 1963.Last previous edition approved in 2013 as D2149 13.DOI:10.1520/D2149-13R21.2“Alternating-Current Loss and Permittivity Measurements,”Chapter 2 ofEngineering Dielectrics Volume IIB Electrical Properties of Solid InsulatingMaterials:Measurement Techniques,ASTM STP 926,ASTM International,1987.3“Dielectric Loss in Solids,”Chapter 1 of Engineering Dielectrics Volume IIAElectrical Properties of Solid Insulating Materials:Molecular Structure andElectrical Behavior,ASTM STP 783,ASTM International,1983.4For 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.5The last approved version of this historical standard is referenced onwww.astm.org.Copyright 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 Organization Technical Barriers to Trade(TBT)Committee.15.3 Specimen HolderThe suggested arrangement shown