Designation:D1512−21StandardTestMethodsforCarbonBlack—pHValue1ThisstandardisissuedunderthefixeddesignationD1512;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethods,TestMethodA—BoilingSlurryandTestMethodB—SonicSlurry,areusedtoindicatethepHofthecarbonblacksurfacebymeasuringthepHofwaterincontactwiththecarbonblack.NOTE1—ThepHofthecarbonblackisoftenusedinthisindustrytoindicatetherelativeacidityoralkalinityofcarbonblackandwillbeusedintheremainderofthesetestmethodstodescribethisproperty.NOTE2—TestMethodAandTestMethodBdonotalwaysgivethesameresults.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1799PracticeforCarbonBlack—SamplingPackagedShipmentsD1900PracticeforCarbonBlack—SamplingBulkShip-mentsD4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustriesE70TestMethodforpHofAqueousSolutionsWiththeGlassElectrode3.SignificanceandUse3.1ThepHlevelofacarbonblackisknowntoaffectthevulcanizationofsomerubbercompounds.TESTMETHODA—BOILINGSLURRY4.Apparatus4.1pHMeter,(digitalisre...
