ASTM_D_6343_-_14.pdf

Designation:D634314Standard Test Methods forThin Thermally Conductive Solid Materials for ElectricalInsulation and Dielectric Applications1This standard is issued under the fixed designation D6343;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.Scope*1.1 This standard is a compilation of test methods forevaluating properties of thermally conductive electrical insu-lation sheet materials to be used for dielectric applications.1.2 Such materials are thin,compliant sheets,typicallyproduced by mixing thermally conductive particulate fillerswith organic or silicone binders.For added physical strengththese materials are often reinforced with a woven or nonwovenfabric or a dielectric film.1.3 These test methods apply to thermally conductive sheetmaterial ranging from about 0.02 to 6-mm thickness.1.4 The values stated in SI units are to be regarded asstandard.NOTE1There is no IEC publication or ISO standard equivalent to thisstandard.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.See also 18.1.2 and19.1.2.2.Referenced Documents2.1 ASTM Standards:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD374M Test Methods for Thickness of Solid ElectricalInsulation(Metric)D412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 Terminology Relating to PlasticsD1000 Test Methods for Pressure-Sensitive Adhesive-Coated Tapes Used for Electrical and Electronic Applica-tionsD1458 Test Methods for Fully Cured Silicone Rubber-Coated Glass Fabric and Tapes for Electrical InsulationD1711 Terminology Relating to Electrical InsulationD2240 Test Method for Rubber PropertyDurometer Hard-nessD5470 Test Method for Thermal Transmission Properties ofThermally Conductive Electrical Insulation MaterialsD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)33.Terminology3.1 Definitions:3.1.1 For definitions of terms used in these test methods andassociated with electrical and electronic insulating materials,use Terminology D1711.3.1.2 For definitions of terms used in these test methods andassociated with plastics,use Terminology D883.3.2 Definitions of Terms Specific to This Standard:3.2.1 apparent thermal conductivity,nthe time rate of heatflow,under steady conditions,through unit area,per unittemperature gradient in the direction perpendicular to the area,for a nonhomogeneous material.3.2.1.1 See 16.1 for a discussion of the terms thermalconductivity and apparent thermal conductivity.To avoidconfusion,these test methods use apparent thermal conductiv-ity for measurements of homogeneous and nonhomogeneousmaterials.1These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and are the direct responsibility ofSubcommittee D09.19 on Dielectric Sheet and Roll Products.Current edition approved Nov.1,2014.Published November 2014.Originallyapproved in 1998.Last previous edition approved in 2010 as D6343 10.DOI:10.1520/D6343-14.2For 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.3The last approved version 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 States1 4.Significance and Use4.1 These test methods are useful to determine complianceof thermally conductive sheet electrical insulation with speci-fication requirements established jointly by a producer and auser.4.2 These test methods have been found useful for qualityassessment.Results of the test methods can be useful inapparatus design.5.Specimen Preparation5.1 From a sample of sufficient size,prepare test specimensof the dimensions and of the quantity to meet the requirementsfor each test procedure.6.Conditioning6.1 Unless otherwise specified,condition specimens in ac-cordance with Pro