Designation:D7670−10(Reapproved2021)StandardPracticeforProcessingIn-serviceFluidSamplesforParticulateContaminationAnalysisUsingMembraneFilters1ThisstandardisissuedunderthefixeddesignationD7670;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheprocessingofin-servicefluidsinpreparationforparticulatecontaminationanalysisusingmembranefiltersandislimitedonlybytheliquid-to-membranefiltercompatibility.1.2Thepracticecoverstheprocedureforfilteringamea-suredvolumeofliquidthroughamembranefilter.Whenthispracticeisused,theparticulatematterwillberandomlydistributedonthefiltersurfaceforsubsequentcontaminationanalysismethods.1.3Thepracticedescribesprocedurestoallowhandlingparticlesinthesizerangebetween2µmand1000µmwithminimumlossesduringhandling.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D287TestMethodforAPIGravityofCrudePetroleumandPetroleumProducts(HydrometerMethod)D1078TestMethodforDistillationRangeofVolatileOr-ganicLiquidsD1193SpecificationforReagentWaterD1353TestMethodforNonvolatileMatterinVolatileSol-ventsforUseinPaint,Varnish,Lacquer,andRelatedProductsD1836SpecificationforCommercialHexanesD2021SpecificationforNeutralDetergent,40PercentAlky-lbenzeneSulfonateType(Withdrawn2000)3F312TestMethodsforMicroscopicalSizingandCountingParticlesfromAerospaceFluidsonMembraneFilters3.Terminology3.1Definitions:3.1.1filteredliquiddispenser,n—asusedinthispractice,adispenserca...
