ASTM_D_6351_-_22.pdf

Designation:D635122Standard Test Method forDetermination of Low Temperature Fluidity and Appearanceof Hydraulic Fluids1This standard is issued under the fixed designation D6351;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.Scope*1.1 This test method covers the fluidity and appearance ofhydraulic fluids after storage at low temperature.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.2.1 ExceptionIn 6.1.1,the material is designated in cStas this is the common name used for this type of oil.1.3 WARNINGMercury has been designated by manyregulatory agencies as a hazardous substance that can causeserious medical issues.Mercury,or its vapor,has been dem-onstrated to be hazardous to health and corrosive to materials.Use caution when handling mercury and mercury-containingproducts.See the applicable product Safety Data Sheet(SDS)for additional information.The potential exists that sellingmercury or mercury-containing products,or both,is prohibitedby local or national law.Users must determine legality of salesin their location.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific warning statements,see 1.3 and Section 6.1.5 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:2D97 Test Method for Pour Point of Petroleum ProductsD2500 Test Method for Cloud Point of Petroleum Productsand Liquid FuelsD6080 Practice for Defining the Viscosity Characteristics ofHydraulic FluidsE1 Specification for ASTM Liquid-in-Glass Thermometers3.Summary of Test Method3.1 After preliminary drying to remove trace amounts ofwater,the sample is cooled to a specified temperature.Afterseven consecutive days,the sample is examined for its abilityto flow and observed for homogeneity.4.Significance and Use4.1 The temperature at which a lubricant remains fluid andhomogeneous after seven days is an index of its ability towithstand prolonged exposure to cold temperature.With veg-etable oils and some synthetic esters,it is necessary to doextended cold storage testing.Quick cool,short-term tests,such as Test Methods D97 and D2500,do not adequatelypredict the tendency to solidify over longer time spans at coldtemperatures.4.2 This test method is not intended to indicate coldtemperature pumpability performance.A separate assessmentof viscometric performance should be made in order to assesscold flow properties,which are important in order to avoidsystem damage in cold temperature applications.Suitableguidelines for such testing and test temperatures for variousviscosity grades can be found in Practice D6080.4.3 No specific temperature of measurement is given in thistest method because fluids with different viscosity grades have1This 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 May 1,2022.Published July 2022.Originally approvedin 1999.Last previous edition approved in 2016 as D6351 10(2016).DOI:10.1520/D6351-22.2For 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.*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 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.1different cold temperature performance expectations.For guid-ance on temperature selection relative to an intended lowtemperature viscosity grade or ISO VG,consult PracticeD6080.As an example of using Practice D6080,a L22viscosity grade would be evaluated at the lowest temperaturefor that grade,namely 22.9 C.Alternatively,a fluid can beevaluated at the lowest temperature expected for field service.5.Apparatus