ASTM_D_4898_-_16.pdf

Designation:D489816Standard Test Method forInsoluble Contamination of Hydraulic Fluids by GravimetricAnalysis1This standard is issued under the fixed designation D4898;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the determination of insolublecontamination in hydraulic fluids by gravimetric analysis.Thecontamination determined includes both particulate and gel-like matter,organic and inorganic,which is retained on amembrane filter disk of pore diameter as required by applicablespecifications(usually 0.45 m or 0.80 m).1.2 To indicate the nature and distribution of the particulatecontamination,the gravimetric method should be supple-mented by occasional particle counts of typical samples inaccordance with Test Method F312.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For a specificwarning statement,see 6.1.2.Referenced Documents2.1 ASTM Standards:2A555/A555M Specification for General Requirements forStainless Steel Wire and Wire RodsD1836 Specification for Commercial HexanesD2021 Specification for Neutral Detergent,40 PercentAlky-lbenzene Sulfonate Type(Withdrawn 2000)3E319 Practice for the Evaluation of Single-Pan MechanicalBalancesF302 Practice for Field Sampling of Aerospace Fluids inContainersF303 Practices for Sampling for Particles in AerospaceFluids and ComponentsF312 Test Methods for Microscopical Sizing and CountingParticles from Aerospace Fluids on Membrane FiltersF314 Methods of Test for Identification of Metallic andFibrous Contaminants in Aerospace Fluids(Withdrawn1990)32.2 Military Standard:MIL-C-81302C Cleaning Compound Solvent Trichlorotrif-luoroethane43.Summary of Test Method3.1 The insoluble contamination is determined by passing agiven quantity of a fluid sample through a membrane filter diskand measuring the resultant increase in the mass of the filter.The fluid sample is drawn through the filter by a vacuum andthe insoluble contamination is collected on the surface of thefilter.In addition,the filter disk is microscopically scanned forexcessively large particles,fibers,or other unusual conditions.4.Significance and Use4.1 This test method indicates and measures the amount ofinsoluble contamination of hydraulic fluids.Minimizing thelevels of insoluble contamination of hydraulic fluids is essen-tial for the satisfactory performance and long life of theequipment.Insoluble contamination can not only plug filtersbut can damage functional system components resulting inwear and eventual system failure.5.Apparatus5.1 Microbalance,accurate to 0.005 mg,and the zero shallnot drift more than 0.005 mg during the test period.The ratedaccuracy shall be obtainable by personnel actually making the1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.N0 on Hydraulic Fluids.Current edition approved Jan.1,2016.Published February 2016.Originallyapproved in 1965.Test Method F313 was redesignated as D4898 in 1988.Lastprevious edition approved in 2010 as D4898 90(2010)1.DOI:10.1520/D4898-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-5098*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 weighings,under actual conditions of use and shall be verifiedin accordance with Practice E319.5.2 Membrane Filter Support,fritted glass,sintered metal,or stainless steel screen,to support 25 mm or 47 mm to 51 mmmembrane filters.The support shall be designed to enableattachment of a vacuum flask.5.3 Filtration Funnel,glass or stainless steel,minimumcapacity 15 mL,designed to enable attachment to the mem-brane filter support by means of a suitable clamping device.The filter funnel is calibrated to indicate volume.5.4 Vacuum Flask,with rubber stopper.5.5 Filtered Liquid Dispensers(2)Washing bottles oro