Designation:D4671−05(Reapproved2010)´1StandardTestMethodsforPolyurethaneRawMaterials:DeterminationofUnsaturationofPolyols1ThisstandardisissuedunderthefixeddesignationD4671;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—ReapprovedwitheditorialchangesinJuly2010.1.Scope1.1Thesetestmethodsmeasureunsaturationinpolyetherpolyols.(SeeNote1.)1.1.1TestMethodA,High-VolumeReagentMethod—Usesabout50mLof0.1Mmercuricacetatereagentinmethanoland15gormoreofsample.Thesetestmethodsuseanindicatorforcolorimetricdeterminationofanendpoint.Itisrecommendedforpolyolswithlowvalues(below0.01millequivalentspergram(meq/g))ofunsaturationwherelargesamplesizesarerequired.1.1.2TestMethodB,Low-VolumeReagentMethod—Uses2mLofca.0.05Mmercuricacetatereagentinmethanolandabout1gofsampleorless.Thesetestmethodsuseapotentiometricdeterminationofanendpoint.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsE180PracticeforDeterminingthePrecisionofASTMMethodsforAnalysisandTestingofIndustrialandSpe-cialtyChemicals(Withdrawn2009)33.Terminology3.1Definitions—Fordefinitionsoftermsusedinthesetestmethods,seeTerminologyD883.4.SummaryofTestMethod4.1Carbon-to-carbonunsaturatedcompoundsinthesamplearereactedwithmercuricacetateandmethanolinamethanolicsolutiontoproduceacetoxymercuricmethoxycompoundsandaceticacid.4Theamountofaceticacidreleasedinthisequimolarreaction,whichisdeterminedbytitrationwiths...
