Designation:D4570−02(Reapproved2012)StandardTestMethodforRubberChemicals—DeterminationofParticleSizeofSulfurbySieving(Dry)1ThisstandardisissuedunderthefixeddesignationD4570;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheparticlesizemeasurementofthecoarsefractionofgroundsulfurs.Itislimitedtomeasure-mentofparticlesgreaterthan45µm(No.325sieve).Ifthesulfurisveryfineandthescreensbecomepluggedbythecakingofthesulfur,itmaybenecessarytouseawetsieveprocedureinstead.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E11SpecificationforWovenWireTestSieveClothandTestSievesE145SpecificationforGravity-ConvectionandForced-VentilationOvens3.SignificanceandUse3.1Thistestmethodisusedtoevaluatesulfurforsuitabilityasarubbervulcanizingagent.Sulfurparticlesmustbesmallenoughtodissolveinrubberduringcuretoproduceauniformnetworkofcross-links.Thistestmethodisusedasaqualitycontrolmethodtoensurethatlargeparticlesarenotpresent(andtodetermineifthesulfurfollowsatypicalpatternforsizedistribution).4.Apparatus4.1StandardSieves,stainlesssteel,203mmindiameterconformingtoSpecificationE11.Thestainlesssteelclothshallrangeinmeshsizefrom45to250µm.Thesievesetshouldincludealidandabottompan.4.2MechanicalSieveShakers,suchasaTylerRo-Tap3orequivalentunit.4.3Balance,withaminimumcapacityof500gsensitiveto0.1g.4.4Balance,withaminimumcapacityof150gsensitiveto0.001g.4.5Oven,circulatingairtype,controlledto7062°C.5.Reagent5.1Tri-calciumPhosphate,screenedtoafinenessoflessthan45µm.6.Procedure6.1W...
