1、Designation:D827720Standard Test Method forWet Filterability of Lubricants and Hydraulic Fluids by MassFlow Technique1This standard is issued under the fixed designation D8277;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、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 test method covers determination of the wet filter-ability of lubricants and hydraulic fluids based upon mass flowr
3、ate measurements through a 0.8 m membrane after ageing ofthe fluid in the presence of water.The procedure applies tolubricants and hydraulic fluids that are formulated with Ameri-can Petroleum Institute(API)Group I,II,III,IV and certain Vbase stocks.Products formulated with water or base stocks that
4、are heavier than water are out of scope.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the use
5、r of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in th
6、e 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:2D1193 Specification for Reagent WaterD1401 Test Method for Water Separability o
7、f Petroleum Oilsand Synthetic FluidsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricants2.2 ISO Standards:3ISO 13357 Petroleum products Determination of the filter-
8、ability of lubricating oils Part 1:Procedure for oils in thepresence of water3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 filterability,nthe ability of lubricants and hydraulicfluids to pass through fine filters without plugging them;it is adimensionless number that is the r
9、atio between two filtrationrates.3.1.2 Stage I filterability,nthe ratio,expressed as apercentage,between 200 g and the mass of oil filtered in thetime that 200 g would have theoretically taken,assuming noplugging of the membrane;oils having good Stage Ifilterability,but only a poor Stage II performa
10、nce,would beunlikely to give performance problems in use,unless extremelyfine system filters are utilized.3.1.3 Stage II filterability,nthe ratio,expressed as apercentage,between the flow rate near the start of filtration,and the flow rate between 160 g and 240 g of filtered mass;anoil with good Sta
11、ge II filterability would be unlikely to givefiltration problems even in the most extreme conditions or withfine(less than 5m)filtration present;it would thus besuitable for use in more critical hydraulic and lubricationsystems.3.2 Symbols:3.2.1 FIStage I filterability index,dimensionless.3.2.2 FIIS
12、tage II filterability index,dimensionless.3.2.3 Mactual mass of oil filtered at Tm,g.3.2.4 T8time corresponding to 8 g of oil filtered,s.3.2.5 T40time corresponding to 40 g of oil filtered,s.3.2.6 T160time corresponding to 160 g of oil filtered,s.3.2.7 T240time corresponding to 240 g of oil filtered
13、,s.1This 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 March 1,2020.Published March 2020.DOI:10.1520/D8277-20.2For referenced ASTM standa
14、rds,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.3Available from International Organization for Standardization(ISO),ISOCentral Secretariat,BI
15、BC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.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 stan
16、dardization 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.3.2.8 Tmtheoretical time for 192 g of oil to filter,s.4.Summary of Test Method4.1 In this test method,fluid is treated with water at anelevated temperature,filtered under specific conditions througha membrane of 0.8 m mean pore diameter,and the times forthe specific filtrate masses are recor
