Designation:D6979−18StandardTestMethodforPolyurethaneRawMaterials:DeterminationofBasicityinPolyols,ExpressedasPercentNitrogen1ThisstandardisissuedunderthefixeddesignationD6979;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodmeasuresthebasicconstituentsinpolyolsthataresolubleinglacialaceticacidandreactivewithperchloricacid.Samplescontaining0.3–10%nitrogenhavebeenevaluatedbythismethod.Thistestmethodisapplicabletopolyetherpolyolsandpolyetherpolyolblendsthatareusedinurethanereactions.(SeeNote1.)1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThisstandardisequivalenttoISO25761:08.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsE180PracticeforDeterminingthePrecisionofASTMMethodsforAnalysisandTestingofIndustrialandSpe-cialtyChemicals(Withdrawn2009)3E691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISOStandards:4ISO25761Plastics—Polyolsforuseintheproductionofpolyurethanes—Determinationofbasicity(totalaminevalue),expressedaspercentnitrogen3.Terminology3.1Definitions—FordefinitionsoftermsusedinthistestmethodseeTerminologyD883.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1percentnitro...
