Designation:D4893−20StandardTestMethodforDeterminationofPitchVolatility1ThisstandardisissuedunderthefixeddesignationD4893;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthepercentofpitchvolatility.1.2Sincethistestmethodisempirical,strictadherencetotheprocedureisnecessary.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesaregivenforinformationonly.1.3.1Exceptions—Thediameterofaspecialaluminumblockismeasuredininches.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E11SpecificationforWovenWireTestSieveClothandTestSieves3.SummaryofTestMethod3.1Analuminumweighingdishwithabout15gofspeci-menisintroducedintothecavityofametalblockheatedandmaintainedat350°C(662°F).After30min610sduringwhichthevolatilesaresweptawayfromthesurfaceoftheliquidpitchbypreheatednitrogen,thesampleistakenoutandallowedtocooldowninthedesiccator.Thepitchvolatilityisdeterminedbythesampleweightlossandreportedaspercentweightloss.4.SignificanceandUse4.1Thistestisusefulinevaluatingandcharacterizingpitchphysicalpropertiesincomparingtheconsistencyofshipmentsandsourcesofsupply.5.Apparatus5.1AluminumBlock,341⁄2in.outsidediameter,composedoftwosections(Figs.1-4).5.1.1Thetopblockismaintainedatachosenconstan...
