1、Designation:D109212(Reapproved 2017)Standard Test Method forMeasuring Apparent Viscosity of Lubricating Greases1This standard is issued under the fixed designation D1092;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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.Scope1.1 This test method covers measurement,in po
3、ises,of theapparent viscosity of lubricating greases in the temperaturerange from 54 C to 38 C(65 F to 100 F).Measurementsare limited to the range from 25 P to 100 000 P at 0.1 s1and1 P to 100 P at 15 000 s1.NOTE1At very low temperatures the shear rate range may be reducedbecause of the great force
4、required to force grease through the smallercapillaries.Precision has not been established below 10 s1.1.2 This standard uses inch-pound units as well as SI(acceptable metric)units.The values stated first are to beregarded as standard.The values given in parentheses are forinformation only.The capil
5、lary dimensions in SI units in Fig.A1.1 and Fig.A1.2 are standard.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 sh
6、ould be taken when handling mercury andmercury containing products.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 you
7、r state or countrymay be prohibited by law.1.3.1 In addition,temperature measuring devices such asliquid-in-glass thermometers,thermocouples,thermistors,orplatinum resistance thermometers that provide equivalent orbetter accuracy and precision,that cover the temperature rangefor ASTM thermometer 49C
8、,may be used.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 regulatory limitations prio
9、r to use.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-mendations issued by the World Trade Organization TechnicalBar
10、riers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D88 Test Method for Saybolt ViscosityD217 Test Methods for Cone Penetration of LubricatingGreaseD3244 Practice for Utilization of Test Data to DetermineConformance with Specifications3.Terminology3.1 Definitions:3.1.1 apparent vi
11、scosity,nof a lubricating grease is theratio of shear stress to shear rate calculated from Poiseuillesequation,and is measured in poises(see 10.1).3.1.2 capillary,nFor the purpose of this test method,acapillary is any right cylindrical tube having a length todiameter ratio of 40 to 1.3.1.3 shear rat
12、e,nthe rate at which a series of adjacentlayers of grease move with respect to each other;proportionalto the linear velocity of flow divided by the capillary radius,and is thus expressed as reciprocal seconds.4.Summary of Test Method4.1 The sample is forced through a capillary by means of afloating
13、piston actuated by the hydraulic system.From thepredetermined flow rate and the force developed in the system,the apparent viscosity is calculated by means of Poiseuillesequation.A series of eight capillaries and two pump speeds areused to determine the apparent viscosity at sixteen shear rates.The
14、results are expressed as a log-log plot of apparent viscosityversus shear rate.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.02 on Consistency and Related Rheological Tests.Cur
15、rent edition approved Aug.1,2017.Published August 2017.Originallyapproved in 1950.Last previous edition approved in 2012 as D1092 12.DOI:10.1520/D1092-12R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMSt
16、andards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,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,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(T
