Designation:D3616−95(Reapproved2019)StandardTestMethodforRubber—DeterminationofGel,SwellingIndex,andDiluteSolutionViscosity1ThisstandardisissuedunderthefixeddesignationD3616;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthedilutesolutionviscosity(DSV),thegelcharacteristics,andtheswellingindexofrawnon-oil-extendedandnon-pigmentedSBRandNBR.1.2ThistestmethodmaybeusedtodeterminetheDSVandgelcharacteristicsofrubbersotherthanSBRandNBR,however,solventsotherthan2-butanoneandtoluenemayberequired.1.3Thistestmethodisnotintendedforthemeasurementofmicro-gel.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries2.2OtherDocument:3“ReagentChemicals,AmericanChemicalSocietySpecifi-cations”3.SummaryofTestMethod3.1Aweighedsampleisallowedtostand16to20hinasuitablesolvent.Thesol,orsolubleportion,isremovedfromtherubbermixtureandtheviscosityisdeterminedonthissolution.3.2Aportionofthesolisusedforthedeterminationofthedissolvedrubber.Thisisobtainedbyevaporationofthesolvent.3.3Theswellingindexofthegelisdetermined...
