Designation:D4661−13StandardTestMethodsforPolyurethaneRawMaterials:DeterminationofTotalChlorineinIsocyanates1ThisstandardisissuedunderthefixeddesignationD4661;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodsdeterminethetotalchlorinecontentofaromaticisocyanatesusedaspolyurethanerawmaterials.Thedifferencebetweenthetotalchlorinecontentandthehydrolyzablechlorinecontent(seeTestMethodD4663)isameasureoftheamountofo-dichlorobenzeneandotherring-substitutedchlorinatedproductsthatarepresent.Bothproce-duresareapplicabletoavarietyoforganiccompoundsbuttheamountofsampleusedmayhavetobevaried.(SeeNote1.)1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD1193SpecificationforReagentWaterD4663TestMethodforPolyurethaneRawMaterials:Deter-minationofHydrolyzableChlorineofIsocyanates3.Terminology3.1Definitions—FordefinitionsoftermsusedinthesetestmethodsseeTerminologyD883.4.SummaryofTestMethod4.1Ineachtestmethod,theorganicmatterinthesampleisdestroyedbycombustionwithoxygen,theorganicallycom-binedchlorinebeingconvertedtoionicchloride.Thechlorideisdeterminedpotentiometricallybytitrationwithsilvernitrate(AgNO3)solution.4.1.1TestMethodA—Thesampleiscombustedinapres-surizedoxygenbomb.4.1.2TestMethodB—Thesampleiscombustedatatmo-sphericpressureinaSchönigeroxygenflask.35.SignificanceandUse5.1Thesetestmethodscanbeusedforresearchorforqualitycontroltodete...
