Designation:D4898−90(Reapproved2010)´1StandardTestMethodforInsolubleContaminationofHydraulicFluidsbyGravimetricAnalysis1ThisstandardisissuedunderthefixeddesignationD4898;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.´1NOTE—UpdatedwithdrawnstandardsinReferencedDocumentseditoriallyinJuly2011.1.Scope1.1Thistestmethodcoversthedeterminationofinsolublecontaminationinhydraulicfluidsbygravimetricanalyses.Thecontaminationdeterminedincludesbothparticulateandgel-likematter,organicandinorganic,whichisretainedonamembranefilterdiskofporediameterasrequiredbyapplicablespecifications(usually0.45µmor0.80µm).1.2Toindicatethenatureanddistributionoftheparticulatecontamination,thegravimetricmethodshouldbesupple-mentedbyoccasionalparticlecountsoftypicalsamplesinaccordancewithTestMethodF312.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Foraspecificwarningstatement,see6.1.2.ReferencedDocuments2.1ASTMStandards:2A555/A555MSpecificationforGeneralRequirementsforStainlessSteelWireandWireRodsD1836SpecificationforCommercialHexanesD2021SpecificationforNeutralDetergent,40PercentAlky-lbenzeneSulfonateType(Withdrawn2000)3E319PracticefortheEvaluationofSingle-PanMechanicalBalancesF302PracticeforFieldSamplingofAerospaceFluidsinContainersF303PracticesforSamplingforParticlesinAerospaceFluidsandComponentsF312TestMethodsforMicroscopicalSizingandCountingParticlesfromAerospaceFluidsonMembraneFiltersF314MethodsofTestforIdentificationo...
