Designation:D2121−16StandardTestMethodsforPolymerContentofStyreneMonomer1ThisstandardisissuedunderthefixeddesignationD2121;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodscoverthedeterminationofthepolymercontentofstyrenemonomer.Itshouldbenoted,however,thatdimersandtrimersarenotmeasuredbythesetestmethods.1.2TestMethodA,whichisbasedontheuseofaspectro-photometerorphotometer,isintendedforthequantitativedeterminationofthepolymercontentofstyrenemonomerinconcentrationsupto15mg/kg.Samplescontainingmorethan15mg/kgofpolymermustbesuitablydilutedbeforemeasure-ment.1.3TestMethodBisarapidvisualprocedurethatisintendedfortheapproximateevaluationofpolymertoamaximumconcentrationof1.0mass%.Sampleshavingapolymercontentof1.0mass%orgreatershouldbesuitablydilutedpriortomeasurement.1.4Indeterminingtheconformanceofthetestresultsusingthismethodtoapplicablespecifications,resultsshallberoundedoffinaccordancewiththerounding-offmethodofPracticeE29.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection9.2.ReferencedDocuments2.1ASTMStandards:2D2827SpecificationforStyreneMonomerD3437PracticeforSamplingandHandlingLiquidCyclicProductsD4790TerminologyofAromaticHydrocarbonsandRelatedChemicalsD6809GuideforQualityControlandQualityAssuranceProceduresforAromaticHydrocarbonsandRelatedMa-terialsE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisiono...
