Designation:D4572−89(Reapproved2012)StandardTestMethodforRubberChemicals—WetSieveAnalysisofSulfur1ThisstandardisissuedunderthefixeddesignationD4572;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheevaluationoftheparticlesizedistributionofthecoarsefractionofsulfur.Itislimitedtothemeasurementofthoseparticlesgreaterthan45µm(No.325sieve).1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.SignificanceandUse3.1Thistestmethodisusedtoevaluatesulfurforsuitabilityasarubbervulcanizingagent.Sulfurparticlesmustbesignifi-cantlysmallenoughtodissolveinrubberduringcureandproduceauniformnetworkofcross-links.Thistestmethodisusedasaqualitycontrolmethodtoensurethatnoexcessivelylargesulfurparticlesarepresentandtoseeiftheproductfollowsatypicalpatternofsizedistribution.3.2Thisprocedureisnecessarywhenproblemsofthesulfurcakingoccurwiththeuseofthedrysievingprocedureforparticlesize.4.Apparatus4.1StandardSieves,stainlesssteel,76mmdiametercon-tainingselectedstainlesssteelwireclothintherangeof45to250µmmeshcount.4.2No.6StiffBristleArtistBrush,having10to15mmlongbristles.4.3Balance,withaminimumcapacityof150gsensitiveto0.001g.4.4Oven,circulatingairtype,controlledto7062°C.5.Materials5.1LiquidDetergent.6.Procedure6.1Weigh10.0gofthesulfursampleintoa250-cm3beaker.Wetthesulfurwith25mLofwater.Mixthoroughlywithaglassstirringrodtoguaranteewettingallthesulfur.NOTE1—A1%solutionofaliquiddetergentmaybeusedifthesulfursampledoesnotwetoutp...
