Designation:D5558−95(Reapproved2017)StandardTestMethodforDeterminationoftheSaponificationValueofFatsandOils1ThisstandardisissuedunderthefixeddesignationD5558;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthesaponi-ficationvalueoffatsandoils.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SignificanceandUse2.1Thistestmethodisintendedforuseinthedeterminationofthesaponificationvalueoffatsandoilsusedinthemanufactureoffatliquorsforthepurposeofqualityassurance.3.ApparatusandReagents3.1ErlenmeyerFlasks,Corning2alkaliresistant,Kimbleresistant,orequivalent,250or300mL.3.2AirCondensers,minimumlength650mm.3.3WaterBathoraHotPlate,withvariableheatcontrol.3.4HydrochloricAcid,0.5N,accuratelystandardized.3.5AlcoholicPotassiumHydroxide,3addedtoa2-Lflaskfrom1to1.5Lof95%ethylalcohol(U.S.S.D.Formula3A2ispermitted)andafewgrams(5to10g)ofpotassiumhydroxide.Afterboilingunderarefluxcondenseronawaterbathfor30to60min,thealcoholshallbedistilledandcollected.Forthepreparationofalcoholicpotassiumhydroxide,40gofpotassiumhydroxide,lowincarbonate,shallbedissolvedin1Lofthedistilledalcohol,keepingthetemperaturebelow15.5°C(60°F)whilethealkaliisbeingdissolved.Thissolutio...
