Designation:D4572−21StandardTestMethodforRubberChemicals—WetSieveAnalysisofSulfur1ThisstandardisissuedunderthefixeddesignationD4572;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheevaluationoftheparticlesizedistributionofthecoarsefractionofsulfur.Itislimitedtothemeasurementofthoseparticlesgreaterthan45µm(No.325sieve).1.2Units—ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE11SpecificationforWovenWireTestSieveClothandTestSieves3.SignificanceandUse3.1Thistestmethodisusedtoevaluatesulfurforsuitabilityasarubbervulcanizingagent.Sulfurparticlesmustbesignifi-cantlysmallenoughtodissolveinrubberduringcureandproduceauniformnetworkofcross-links.Thistestmethodisusedasaqualitycontrolmethodtoensurethatnoexcessivelylargesulfurparticlesarepresentandtoseeiftheproductfollowsatypicalpatternofsizedistribution.3.2Thisprocedureisnecessarywhenproblemsofthesulfurcakingoccurwiththeuseofthedrysievingprocedureforparticlesize.4.Apparatus4.1StandardSieves,stainlesssteel,76mmdiametercon-tainingselectedstainlesssteelwireclo...
