Designation:C1069−09(Reapproved2014)StandardTestMethodforSpecificSurfaceAreaofAluminaorQuartzbyNitrogenAdsorption1ThisstandardisissuedunderthefixeddesignationC1069;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthespecificsurfaceareaofaluminasandsilicasusedinthemanufactureofceramics.Thetestmethodisageneralone,permittingtheuseofanymoderncommercialnitrogenadsorptionapparatusbutstrictlydefiningtheoutgassingprocedure.CalculationsarebasedontheBrunauer-Emmett-Teller(BET)equation.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E173PracticeforConductingInterlaboratoryStudiesofMethodsforChemicalAnalysisofMetals(Withdrawn1998)33.Summary3.1Anappropriatesizesampleisdegassedfor1hat423Kbeforeproceedingwiththeanalysisasprescribedbythemanufactureroftheinstrumentused.Thesampleisaccuratelyweighedafteranalysis.3.2CalculationsarebasedontheBETequations,adaptedwherenecessaryfortheequipmentbeingused.Thecross-sectionalareaofthenitrogenmoleculeistakenas0.162nm2.4.SignificanceandUse4.1Bothsellersandpurchasersofaluminaandquartzwillfindthetestmethodusefultodeterminethespecificsurfaceareaandindirectlyasameasureoftheparticlesizeformaterialspecifications,manufacturingcontrol,andresearchanddevel-opment.5.Apparatus5.1SpecificSurfaceAreaAnalyzer,recently(after1970)manufacturedcommercialequipmentemployinglow-temperature(77K)nitrogenadsorption.Thistestmethodmaybedynamicorstatic.5.2DegassingEquipment,suitabletothe...
