Designation:D7723−18StandardTestMethodforRubberProperty—Macro-DispersionofFillersinCompounds1ThisstandardisissuedunderthefixeddesignationD7723;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaproceduretomeasurethemacro-dispersionoffillersinarubbermatrixbyquantifyingthesurfaceroughnessofafreshlycutspecimenusinganopticalmicroscopeinreflectionmode.1.2Themethodprovidesaproceduretomeasurethequalityofmixingofreinforcingfillerssuchassilicaandcarbonblack,aswellasinertfillerssuchaschalk,clayandothersolids.1.3Themethodincludesasamplepreparationprocedureforfilleduncuredrubbercompoundsaswellasfilledcuredrubbercompounds.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2663TestMethodsforCarbonBlack—DispersioninRub-berD3053TerminologyRelatingtoCarbonBlack3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1agglomerates,n—anynumberoffilleraggregatesheldtogetherbyvanderWaalsForces(carbonblack)orhydrogenbonding(silica).3.1.2macrodispersion,n—degreeofdistributionoffillerintoacompound,generallyonascaleoflessthan100µmbutgreaterthan2µm;representsmicronrangeagglomeration.3.1.3nodges,n—bumpsinacutsurfacecausedb...
