Designation:D7634−10(Reapproved2017)StandardTestMethodforVisualizingParticulateSizesandMorphologyofParticlesContainedinHydrogenFuelbyMicroscopy1ThisstandardisissuedunderthefixeddesignationD7634;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisprimarilyintendedforvisualizingandmeasuringthesizesandmorphologyofparticulatesinhydrogenusedasafuelforfuelcellorinternalcombustionenginepoweredvehicles.Thistestmethoddescribesproce-duresrequiredtoobtainsizeandmorphologydataofknownquality.Thistestmethodcanbeappliedtoothergaseoussamplesrequiringdeterminationofparticulatesizesandmor-phologyprovidedtheuser’sdataqualityobjectivesaresatis-fied.1.2Mentionoftradenamesinstandarddoesnotconstituteendorsementorrecommendation.Othermanufacturersofequipment,softwareorequipmentmodelscanbeused.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D7650TestMethodforSamplingofParticulateMatterinHighPressureHydrogenusedasaGaseousFuelwithanIn-StreamFilter2.2SAEStandards:3SAETIRJ2719HydrogenQualityGuidelineforFuelCellVehicles,April2008SAEJ6000CompressedHydrogenSurfaceVehicleRefuel-ingConnectionDevices3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1....
