1、Designation:D226515Standard Test Method forDropping Point of Lubricating Grease Over WideTemperature Range1This standard is issued under the fixed designation D2265;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.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 method covers the determination of
3、the drop-ping point of lubricating grease.1.2This test method uses mercury thermometers.WARNINGMercury has been designated by many regula-tory agencies as a hazardous material that can cause centralnervous system,kidney and liver damage.Mercury,or itsvapor,may be hazardous to health and corrosive to
4、 materials.Caution should be taken when handling mercury and mercurycontaining products.See the applicable product MaterialSafety Data Sheet(MSDS)for details and EPAs websitehttp:/www.epa.gov/mercury/faq.htmfor additional informa-tion.Users should be aware that selling mercury and/ormercury containi
5、ng products into your state or country may beprohibited by law.The responsible subcommittee,D02.G0.03,continues to explore alternatives to eventually replace themercury thermometers.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibi
6、lity of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D217 Test Methods for Cone Penetration of LubricatingGreaseD566 Test Method for Dropping Point of Lu
7、bricating GreaseD3244 Practice for Utilization of Test Data to DetermineConformance with SpecificationsE1 Specification for ASTM Liquid-in-Glass Thermometers3.Terminology3.1 Definitions:3.1.1 dropping point,na numerical value assigned to agrease composition representing the corrected temperature atw
8、hich the first drop of material falls from the test cup andreaches the bottom of the test tube.3.1.1.1 DiscussionIn the normal and proper operation ofthis test method,the observed dropping point is corrected byadding to it a value representing one third of the differencebetween the oven block temper
9、ature and the observed droppingpoint temperature.This corrected value is recorded as thedropping point of the grease.3.1.2 lubricating grease,na semi-fluid to solid product ofa thickener in a liquid lubricant.3.1.2.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immobilizes t
10、he liquid lubricant bysurface tension and other physical forces.Other ingredients arecommonly included to impart special properties.D2173.1.3 observed dropping point,nthe value noted on thethermometer monitoring the internal temperature of the greasetest cup when the first drop of material falls fro
11、m the test cupand reaches the bottom of the test tube.3.1.4 thickener,nin lubricating grease,a substance com-posed of finely-divided particles dispersed in a liquid to formthe products structure.3.1.4.1 DiscussionThickeners can be fibers(such as vari-ous metallic soaps)or plates or spheres(such as c
12、ertainnon-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 relatively stable,gel-likestructure with the liquid lubricant.D2174.Summar
13、y of Test Method4.1 A grease sample in a grease test cup is supported in atest tube placed in an aluminum block oven at a preset constanttemperature.Asample thermometer is placed in the tube and sopositioned that it measures the temperature in the sample cupwithout coming in contact with the grease.
14、1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.03 on Physical Tests.Current edition approved April 1,2015.Published May 2015.Originallyapproved in 1964.Last previous edition app
15、roved in 2014 as D2265 06(2014).DOI:10.1520/D2265-15.2For 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
16、 Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 As the temperature increases,at some point a drop ofmaterial will fall from the cup to the bottom of the test tube.The reading on the sample thermometer is recorded to thenearest degree as the observed dropping point.At the sametime,the temperature of the aluminum block oven is alsorecorded to the nearest degree.4.3 One third the di
