Designation:D5605−94(Reapproved2021)StandardPracticeforStyrene-ButadieneRubber(SBR)—EstablishingRawMooneyViscosityTargetValues1ThisstandardisissuedunderthefixeddesignationD5605;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversameansforproducersandusersofemulsionstyrene-butadienerubber(SBR)toestablishcommontargetvaluesfortheMooneyviscosityoftheserubbers.1.2MooneyviscosityisawidelyusedmeasurementforrubberasdefinedinTestMethodsD1646wheretheprocedureforitsmeasurementisspecified.1.3TheMooneyviscositytargetvalueisdefinedasthemidpointofaMooneyviscosityspecificationrangeestablishedbyaproduceroruserofrubber.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1646TestMethodsforRubber—Viscosity,StressRelaxation,andPre-VulcanizationCharacteristics(MooneyViscometer)3.SignificanceandUse3.1Mooneyviscosityisusedextensivelyintherubberindustryasameasurementofthegeneralqualityofraworcompoundeduncuredrubber.Thisspecialviscosityhasbeenrelatedtoaveragemolecularweightandtohandlingandprocessingcharacteristicsinvariousrubberoperationssuchasmixing,extruding,molding,andsoforth.3.2ThispracticeaddressestherawMooneyviscosityofSBRinitsfinishedstateattheSBRmanufacturer’splantandintheready-to-usestateattherubberproductmanufacturer’splant.3.3DifferentprocessesanddifferentprocessingequipmentoftenrequirerubberofthesamecompositionatdifferentrawMooneyviscositylevels.TheuseofthispracticeenablesproducersofSBRtooffereachrubberwithanumberofstandardtargetMooneyviscosityvaluesandinformsuserswhichMooney...
