Designation:F7−95(Reapproved2016)StandardSpecificationforAluminumOxidePowder1ThisstandardisissuedunderthefixeddesignationF7;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversaluminumoxide(alumina)powderintwoclassesofparticlesize,twochemicalgrades,andtwolevelsofacidity,foruseasaninsulatingcoatingorasaningredientofceramicmixturesforcomponentsofelectronicdevicesasfollows:1.1.1ParticleSizes:1.1.1.1ClassA—ParticlesizeNo.500nominalmesh(nominalaverageparticlesize=24.3µm).1.1.1.2ClassB—ParticlesizeNo.900nominalmesh(nominalaverageparticlesize=1.7µm).1.1.2ChemicalGrades—Grades1and2asspecifiedunderchemicalrequirementsinSection3.1.1.3AcidityLevels:pH(acid)4.5to6.5andpH(neutral)6.5to7.5.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thefollowingsafetyhazardscaveatpertainsonlytothetestmethodsinthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C183PracticeforSamplingandtheAmountofTestingofHydraulicCementE70TestMethodforpHofAqueousSolutionsWiththeGlassElectrode3.ChemicalComposition3.1Foraspecifiedparticlesizeandlevelofacidity,thealuminumoxideshallconformtotherequirementsofTable1astochemicalcomposition.4.PhysicalProperties4.1Thealuminashallbe“chalkwhite,”dry,freefromlumps,andofparticlesizedistributionasagreeduponbetweenpurchaserandseller.5.Sampling5.1Eachlotofaluminashallbeproperlysampledinaccordancewithstandardtechniques,suchasPracticeC183.6.TestMethods6.1Water-SolubleContent:6.1.1Procedure—Determinethetotalwater-solublecontentbymeasuri...
