1、Designation:D635110(Reapproved 2016)Standard 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
2、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 test method covers the fluidity and appearance ofhydraulic fluids after storage at low temperatur
3、e.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
4、 as a hazardous material that can causecentral nervous system,kidney and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for
5、details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information.Users should be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.1.4 This standard does not purport to address all of thesafety concerns,if any,associate
6、d 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 specificwarning statements,see 1.3 and Section 6.2.Referenced Documents2.1 ASTM Standards:2D97 Test Me
7、thod 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 re
8、move 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 o
9、f 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 a
10、t 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.Suitab
11、leguidelines 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 havedifferent cold temperature performance expectations.For guid-ance o
12、n 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 tempe
13、rature expected for field service.5.Apparatus5.1 Test Jar,cylindrical,of clear glass,flat bottom,115 mmto 125 mm in height.The inside diameter of the jar can rangefrom 30.0 mm to 32.4 mm,with a wall thickness of 1.6 mmmaximum.The jar shall have a line to indicate a sample height54 mm 6 3 mm above th
14、e inside bottom.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 June 15,2016.Published July 2016.Originallyapproved in 1999.Last prev
15、ious edition approved in 2010 as D6351 10.DOI:10.1520/D6351-10R16.2For 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.
16、Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Thermometers,having ranges shown below and con-forming to the requirements prescribed in Specification E1.ThermometerTemperatureRangeThermometer NumberASTMIPHigh cloud and pour38 C to+50 C5C1CLow cloud and pour80 C to+20 C6C2CMelting Point+32 C to 127 C61C63C5.2.1 Since separation of liquid column thermometers occa-sionally occurs,thermometers should be checked visuallyimmediately pr
