1、Designation:D404920Standard Test Method forDetermining the Resistance of Lubricating Grease to WaterSpray1This standard is issued under the fixed designation D4049;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 method2covers the ability of a grease to adhereto a metal surface when subjected to a water spray underprescribed laborat
3、ory conditions.1.2 The values stated in SI units are to be regarded asstandard.1.2.1 ExceptionThe values given in parentheses are forinformation only.1.3 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 sta
4、ndard 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 the Decision on
5、 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:3D217 Test Methods for Cone Penetration of LubricatingGreaseD1742 Test Method for Oil Separat
6、ion from LubricatingGrease During StorageE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 lubricating grease,na semi-fluid to solid product ofa dispersion of a thickener in a liquid lubricant.3.1.1.1 DiscussionThe disp
7、ersion 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.D2173.1.2 oil separation,nthe appearance of a liquid fractionfrom an otherwise homogeneous lubricating
8、composition.D17423.1.3 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 fibers(such asvarious metallic soaps)or plates or spheres(such as certainnon-soap thickeners
9、),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 relatively stable,gel-likestructure with the liquid lubricant.D2174.Summary of Test Method4.1 The g
10、rease to be tested is coated on a stainless steelpanel and sprayed with water at the specified test temperatureand pressure.The amount of grease remaining on the panelafter 5 min 6 15 s is a measure of the resistance of the greaseto water spray.5.Significance and Use5.1 This test method is used to e
11、valuate the ability of agrease to adhere to a metal surface when subjected to directwater spray.The results obtained from the use of this testmethod suggest correlation in operations involving direct waterspray impingement such as steel mill roll neck bearing ser-vice.4This test method is used for q
12、uality control and purchasespecifications.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.06 on Functional Tests-Contamination.Current edition approved Nov.1,2020.Published Novem
13、ber 2020.Originallyapproved in 1981.Last previous edition approved in 2016 as D4049 16.DOI:10.1520/D4049-20.2The development of this test method is described in Musilli,T.G.,“WaterSpray-Off Characteristics of Lubricating Grease,”NLGI Spokesman,December1982,pp.323326.3For referenced ASTM standards,vi
14、sit 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.4Cichelli,A.E.“Evaluation of Greases for Steel Mill Service,”NLGISpokesman,August 1973,and A.E.Cich
15、elli,“Grease Lubrication in Steel Millswith Emphasis on Roll Neck Bearings,”NLGI Spokesman,April 1980.*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 standa
16、rd 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.16.Apparatus56.1 Stainless Steel Test Panel,18-8(chromium-nickel)stainless steel,as shown in Fig.1.6.1.1 Grease Application Jig,for applying grease to panel;Fig.2.6.2 Water Spray Apparatus,as shown in Fig.3.6.3
