ASTM_D_7670_-_10_2021.pdf

Designation:D767010(Reapproved 2021)Standard Practice forProcessing In-service Fluid Samples for ParticulateContamination Analysis Using Membrane Filters1This standard is issued under the fixed designation D7670;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.1.Scope1.1 This practice covers the processing of in-service fluidsin preparation for particulate contamination analysis usingmembrane filters and is limited only by the liquid-to-membranefilter compatibility.1.2 The practice covers the procedure for filtering a mea-sured volume of liquid through a membrane filter.When thispractice is used,the particulate matter will be randomlydistributed on the filter surface for subsequent contaminationanalysis methods.1.3 The practice describes procedures to allow handlingparticles in the size range between 2 m and 1000 m withminimum losses during handling.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D287 Test Method for API Gravity of Crude Petroleum andPetroleum Products(Hydrometer Method)D1078 Test Method for Distillation Range of Volatile Or-ganic LiquidsD1193 Specification for Reagent WaterD1353 Test Method for Nonvolatile Matter in Volatile Sol-vents for Use in Paint,Varnish,Lacquer,and RelatedProductsD1836 Specification for Commercial HexanesD2021 Specification for Neutral Detergent,40 PercentAlky-lbenzene Sulfonate Type(Withdrawn 2000)3F312 Test Methods for Microscopical Sizing and CountingParticles from Aerospace Fluids on Membrane Filters3.Terminology3.1 Definitions:3.1.1 filtered liquid dispenser,nas used in this practice,adispenser capable of delivering rinse liquid through a filter withpore size no larger than half the size of the smallest particlebeing considered for measurement.3.1.2 filter patch test,npreparation of a sample by mem-brane filtration,as described in this practice,is often referred toas a patch test,or a filter patch test.4.Significance and Use4.1 This practice provides for the processing of liquidsamples.It will provide the optimum sample processing forvisual contamination methods such as Test Methods F312.5.Apparatus and Materials5.1 Filtration Funnel.5.2 Membrane Filter SupportEither a fritted-glass,sintered-metal,polyphenyl-sulfone,or stainless steel screenmay be used.The support shall be so designed as to enableattachment to a vacuum flask.5.3 Vacuum Flask.5.4 Funnel-Holding DeviceA provision should be madefor the dissipation of static electricity from the funnel.5.5 Clean Bench or HoodSupplied with unidirectionalflow filtered air in which uncovered components may beplaced.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.96.06 on Practices and Techniques for Prediction and Determination ofMicroscopic Wear and Wear-related Properties.Current edition approved Oct.1,2021.Published November 2021.Originallyapproved in 2010.Last previous edition approved in 2017 as D7670 10(2017).DOI:10.1520/D7670-10R21.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.6 Vacuum SourceMinimum vacuum gauge reading of61 kPa(or other metric units acceptable to ASTM).5.7 ForcepsUnserrated tips.5.8 Filtered Liquid Dispenser.5.9 Membrane FilterPore size no greater than half the sizeof the smallest particle being considered for measurement.5.10 Petri DishesGlass.Plastic petri dishes may be usedonly if the selected plastic is known to be compatible with thefiltered liquid.6.Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the s