Designation:D4662−20StandardTestMethodsforPolyurethaneRawMaterials:DeterminationofAcidandAlkalinityNumbersofPolyols1ThisstandardisissuedunderthefixeddesignationD4662;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodsmeasuretheacidicandbasiccon-stituentsinpolyolsandothermaterialsofhighacidityoralkalinitythataresolubleinmixturesoftolueneandethylalcohol.Thesetestmethodsdonotapplytopolyethers.(SeeNote1.)1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD1193SpecificationforReagentWaterE456TerminologyRelatingtoQualityandStatisticsE2935PracticeforConductingEquivalenceTestinginLaboratoryApplications3.Terminology3.1Definitions—TermsusedinthisstandardaredefinedinaccordancewithTerminologyD883,unlessotherwisespeci-fied.Fortermsrelatingtoprecisionandbiasandassociatedissues,thetermsusedinthisstandardaredefinedinaccordancewithTerminologyE456.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1acidnumber,n—thequantityofbase,expressedinmilligramsofpotassiumhydroxide,thatisrequiredtotitrateacidicconstituentspresentin1gofsample.3.2.2alkalinitynumber,n—thequantityofbase,expressedasmilligramsofpotassiumhydroxide,presentin1gofsample.4.SummaryofTestMeth...
