Designation:D7723−11StandardTestMethodforRubberProperty—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-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.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—bumpsinacutsurfacecausedbyfilleragglomeratesinarubbermatrix.3.1.4surfaceroughness,n—thebumps(nodges),orhillsandvalleysthatareonthevisiblesideofasample.3.1.5whitearea,n—theportionofthescanareawhichcontainsnodges,orothersurfacedefects;itisdescribedhereaswhite,becausethereflectedlightfromthesesurfacedefectsiswhite.4.Summaryo...
