1、Designation:D253214Standard Test Method forViscosity and Viscosity Change After Standing at LowTemperature of Aircraft Turbine Lubricants1This standard is issued under the fixed designation D2532;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f 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 meth
3、od covers the determination of the kine-matic viscosity of aircraft turbine lubricants at lowtemperature,and the percent change of viscosity after a 3 h anda 72 h standing period at low temperature.1.1.1 The range of kinematic viscosities covered by this testmethod is from 7700 mm2/s to 14 000 mm2/s
4、 at 40 C andfrom 7000 mm2/s to 17 500 mm2/s at 51 C.The precisionhas only been determined for those materials,kinematicviscosity ranges,and temperatures as shown in the precisionsection.Kinematic viscosities and percent change of viscositymay be measured and reported at other temperatures and othert
5、hermal soak period intervals as agreed by the contractingparties.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 The SI unit used in this test method for KinematicViscosity is mm2/s.For user reference,1 mm2/s=10-6m2/s=1
6、 cSt.1.3 WARNINGMercury has been designated by manyregulatory agencies 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 pro
7、ducts.See the applicable product Ma-terial Safety Data Sheet(MSDS)for 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
8、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 specific hazardstatements,see Se
9、ction 7.2.Referenced Documents2.1 ASTM Standards:2D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D446 Specifications and Operating Instructions for GlassCapillary Kinematic ViscometersD6300 Practice for Determination of Precision and B
10、iasData for Use in Test Methods for Petroleum Products andLubricantsE1 Specification for ASTM Liquid-in-Glass ThermometersE563 Practice for Preparation and Use of an Ice-Point Bathas a Reference TemperatureE644 Test Methods for Testing Industrial Resistance Ther-mometersE1137 Specification for Indus
11、trial Platinum Resistance Ther-mometersE1750 Guide for Use of Water Triple Point CellsE2593 Guide for Accuracy Verification of Industrial Plati-num Resistance ThermometersE2877 Guide for Digital Contact Thermometers2.2 Other Documents:MIL-PRF-7808 Lubricating Oil,Aircraft Turbine Engine,Synthetic Ba
12、se3MIL-PRF-23699 Lubricating Oil,Aircraft Turbine Engine,Synthetic Base,NATO Code Number O-15633.Terminology3.1 Definitions:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07 on Flo
13、w Properties.Current edition approved Dec.1,2014.Published February 2015.Originallyapproved in 1966.Last previous edition approved in 2010 as D2532 10.DOI:10.1520/D2532-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual
14、 Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.*A Summary of Changes section appears at the end of
15、 this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 digital contact thermometer(DCT),nan electronicdevice consisting of a digital display and associated tempera-ture sensing probe.4.Summary of Test Method4.1 Kinematic visc
16、osity and percent change is determined atlow temperature using apparatus defined in Test Method D445and Specifications D446 at time intervals of 3 h and 72 hfollowing an initial measurement at 35 min.5.Significance and Use5.1 Aircraft turbine lubricants,upon standing at low tem-peratures for prolonged periods of time,may show an increasein kinematic viscosity.This increase may cause lubricationproblems in aircraft engines.Thus,this test method is used toensure that the kinematic viscosity does n
