Designation:D5377−93(Reapproved2021)StandardClassificationforRubberCompoundingMaterials—GroundCoal1ThisstandardisissuedunderthefixeddesignationD5377;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisclassificationcoversthecompoundingmaterialknownasgroundcoal.Itisgenerallyusedinrubbercom-poundsasafiller.1.2Therearethreegradesofgroundcoalbasedonparticlesize,ash,andmoisture.Theselectedvaluesforthesepropertiesaresuitableforuseinarubbercompound.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C1070TestMethodforDeterminingParticleSizeDistribu-tionofAluminaorQuartzbyLaserLightScatteringD1208TestMethodsforCommonPropertiesofCertainPigmentsD3174TestMethodforAshintheAnalysisSampleofCoalandCokefromCoalD3175TestMethodforVolatileMatterintheAnalysisSampleofCoalandCokeD4371TestMethodforDeterminingtheWashabilityChar-acteristicsofCoal3.SignificanceandUse3.1Groundcoaliscommonlyusedasaninexpensivefillerinrubbercompoundsasadirectorpartialreplacementforcarbonblackorasadiluentinthecompound.3.2Groundcoalisverycompatiblewithmostrubbersandisveryeasilymixedintothecompound.4.BasisofClassification4.1Particlesizewillhaveadirecteffectonthemodulus,tensilestrength,andtearstrengthofthefinishedrubber.4.2Ashinthecoalwilleffectthespecificgravityandhighashcaninfluencethecuringcharacteristicsoftherubber.4.3Moistureinthegroundcoalatlevelsof0.5%andabovecancauseblistersandscorch.4.4Loweringthedensity(specificgravity)willreducecompoundingcostandaffectvolumeloading.4.5Groundcoalforuseinrubbercompoundsshallconformtothe...
