Designation:D768−01(Reapproved2012)StandardSpecificationforYellowIronOxideHydrated1ThisstandardisissuedunderthefixeddesignationD768;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthepigmentcommerciallyknownasyellowironoxide,hydrated.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.2.ReferencedDocuments2.1ASTMStandards:2D50TestMethodsforChemicalAnalysisofYellow,Orange,Red,andBrownPigmentsContainingIronandManga-neseD185TestMethodsforCoarseParticlesinPigmentsD280TestMethodsforHygroscopicMoisture(andOtherMatterVolatileUndertheTestConditions)inPigmentsD1208TestMethodsforCommonPropertiesofCertainPigments3.CompositionandProperties3.1Thepigmentshallbeamanufacturedyellowironoxideobtainedbychemicalreaction.Itshallbeasoft,finelypowderedpigment,freeofadmixturesofothersubstancesandshallconformtothefollowingrequirements:Totalhydratedoxideofiron,min,%93Totaloxideofiron,Amin,%83Lossonignition,Amax,%13Moistureandothervolatilematter,max,%1.0Watersolublematter,max,%0.50Coarseparticles(totalresidueretainedonaNo.325(45-µm)sieve),max,%0.5Hydrogenionconcentration(pHvalue)4.5to8.0ATotalhydratedoxideofironshallbethesumofironoxideandlossonignition.Lossonignitionshallbecalculatedonthedrymaterial.3.2PasteinOil—Thepasteinoilshallbemadebythoroughlygrindingthespecifiedpigmentwithlinseedoil(withorwithoutasmallamountofvolatilethinner)togetherwith(wherenecessary)smallamountsofwettingordispersingagentstoasemipasteorfluidtypeconsistency.Asreceived,itshallnotbecakedinthecontainerandshallbreakupreadilyinoiltoformasmoothpaintofbrushingconsistency.Itshallmixreadilyinallproportions,withoutcurdling,withlinseedoil,turpentine,orvolatilepetroleumspirits,oranymixturesofthesesubstances.Thepasteshallconformtothefo...
