Designation:D612−88(Reapproved2012)StandardTestMethodforCarbonizableSubstancesinParaffinWax1ThisstandardisissuedunderthefixeddesignationD612;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversdeterminationofcarbonizablesubstancesinparaffinwax.Thetestmethodisapplicabletoparaffinwaxforpharmaceuticaluse,asdefinedbytheU.S.NationalFormulary,withameltingpointasdeterminedinaccordancewithTestMethodD87,between117and149°F(47and65°C).1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SpecificwarningstatementsaregiveninAnnexA1.2.ReferencedDocuments2.1ASTMStandards:2D87TestMethodforMeltingPointofPetroleumWax(CoolingCurve)D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Fivemillilitresofmeltedwaxaretreatedwith5mLofconcentrated,nitrogen-freesulfuricacidat158°F(70°C).Thecoloroftheacidlayeriscomparedwiththatofacolorimetricreferencestandard.Ifthecolorisnotdarkerthanthestandard,thewaxisreportedaspassingthetest.4.SignificanceandUse4.1ThistestmethodisameansforascertainingwhetherpharmaceuticalparaffinwaxconformstothestandardsforqualityprescribedbytheU.S.NationalFormulary.5.Apparatus5.1TestTube,asshowninFig.1,ofheat-resistantglass3fittedwithawell-groundglassstopper,thestopperandthetubebearingidenticalandindestructiblenumbers.Thetubeshallbe14062mminlengthandbetween14.5and15.0mminoutsidediameter,andshallb...
