1、Designation:D174220Standard Test Method forOil Separation from Lubricating Grease During Storage1This standard is issued under the fixed designation D1742;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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 method covers the determination of the ten-de
3、ncy of a lubricating grease to separate oil during storage inboth normally filled and partially filled containers.1.2 This test method is not suitable for greases softer thanNLGI No.1 grade.1.3 The values stated in SI units are to be regarded asstandard,except for the dimensions in Fig.2 and Fig.5,w
4、hereinch-pound units are standard.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 regula
5、tory limitations prior to use.For a specific hazard statement,see 7.1.1.5 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-m
6、endations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 Other Standard:NLGI Grease Consistency Classification33.Terminology3.1 Definitions:3.1.1 lubricating
7、 grease,na semi-fluid to solid product ofa thickener in a liquid lubricant.3.1.1.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immobilizes the liquid lubricant bysurface tension and other physical forces.Other ingredients arecommonly included to impart special properties.3.
8、1.2 oil separation,nthe appearance of a liquid fractionfrom an otherwise homogeneous lubricating composition.3.1.3 thickener,nin lubricating grease,a substance com-posed of finely-divided particles dispersed in a liquid lubricantto form the products structure.3.1.3.1 DiscussionThe thickeners can be
9、fibers(such asvarious metallic soaps)or plates or spheres(such as certainnon-soap thickeners),which are insoluble or,at most,only veryslightly soluble in the liquid lubricant.The general require-ments are that the solid particles be extremely small,uniformlydispersed,and capable of forming a relativ
10、ely stable,gel-likestructure with the liquid lubricant.4.Summary of Test Method4.1 The sample of grease,supported on a 75 m(No.200)sieve,is subjected to 1.72 kPa(0.25 psi)air pressure for 24 h at25 C(77 F).Any oil seepage that occurs drains into a beakerand is weighed.5.Significance and Use5.1 When
11、a lubricating grease separates oil,the remainingcomposition increases in consistency.This can affect the abilityof the product to function as designed.1This test method is under the jurisdiction of the ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibili
12、ty ofSubcommittee D02.G0.03 on Physical Tests.Current edition approved May 1,2020.Published June 2020.Originallyapproved in 1960.Last previous edition approved in 2018 as D1742 18.DOI:10.1520/D1742-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service
13、at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from NLGI,249 SW Noel,Suite 249,Lees Summit,MO 64063,http:/www.nlgi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM In
14、ternational,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,Gui
15、des and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.5.2 It has been found that the results of this test correlatedirectly with the oil separation that occurs in 35 lb pails ofgrease during storage.5.3 This test method is not intended to predict oi
16、l separationtendencies of the grease under dynamic conditions.6.Apparatus6.1 Test Apparatus4-6The assembled apparatus consists ofa tightly fitting cup and cover which contains a 75 m(No.200)sieve strainer for supporting the grease,a funnel forcollecting separated oil,and a 20 mL beaker for retaining theseparated oil.A fitting is provided in the cover for inlet air(1.72 kPa(0.25 psi)and a hole is provided in the side of thecup to prevent back pressure.Fig.1 is a photograph of adisassembled appara
