ASTM_D_4950_-_14.pdf

Designation:D495014Standard Classification and Specification forAutomotive Service Greases1,2This standard is issued under the fixed designation D4950;the number immediately following the designation indicates the year oforiginal adoption or,in the case of 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.INTRODUCTIONThis specification describes current categories of lubricating greases for automotive service-fillapplications.A specific designation is assigned to each category.The system is open ended,that is,new designations are assigned for use with new categories as each new set of grease performancecharacteristics is defined.Grease categories are referenced by automotive manufacturers in makinglubrication recommendations and used by grease suppliers and users in identifying products forspecific applications.1.Scope*1.1 This specification covers lubricating greases suitable forthe periodic relubrication of chassis systems and wheel bear-ings of passenger cars,trucks,and other vehicles.1.2 This specification defines the requirements used todescribe the properties and performance characteristics ofchassis greases and wheel bearing greases for service-fillapplications.1.3 The test requirements(acceptance limits)given in thisspecification are,as the case may be,minimum or maximumacceptable values for valid duplicate test results.Apply noadditional corrections for test precision,such as described inPractice D3244,inasmuch as the precision of the test methodswas taken into account in the determination of the require-ments.1.4 The values stated in SI units are to be regarded asstandard.1.4.1 ExceptionsTest Method D2596 reports test results inkgf units,and Test Method D4289 reports rubber hardness inDurometer Shore A units.2.Referenced Documents2.1 ASTM Standards:3D217 Test Methods for Cone Penetration of LubricatingGreaseD566 Test Method for Dropping Point of Lubricating GreaseD1264 Test Method for Determining the Water WashoutCharacteristics of Lubricating GreasesD1742 Test Method for Oil Separation from LubricatingGrease During StorageD1743 Test Method for Determining Corrosion PreventiveProperties of Lubricating GreasesD2265 Test Method for Dropping Point of LubricatingGrease Over Wide Temperature RangeD2266 Test Method for Wear Preventive Characteristics ofLubricating Grease(Four-Ball Method)D2596 Test Method for Measurement of Extreme-PressureProperties of Lubricating Grease(Four-Ball Method)D3244 Practice for Utilization of Test Data to DetermineConformance with SpecificationsD3527 Test Method for Life Performance of AutomotiveWheel Bearing GreaseD4170 Test Method for Fretting Wear Protection by Lubri-cating GreasesD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4289 Test Method for Elastomer Compatibility of Lubri-cating Greases and Fluids1This classification and specification is under the jurisdiction of ASTMCommittee D02 on Petroleum Products,Liquid Fuels,and Lubricants and is thedirect responsibility of Subcommittee D02.B0.04 on Automotive Greases.Current edition approved Dec.1,2014.Published January 2015.Originallypublished in 1989.Last previous edition approved in 2013 as D4950 13.DOI:10.1520/D4950-142This classification and specification was developed as a cooperative effortamong the American Society for Testing and Materials,the National LubricatingGrease Institute(NLGI),and the Society of Automotive Engineers(SAE).3For 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 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 D4290 Test Method for Determining the Leakage Tenden-cies of Automotive Wheel Bearing Grease Under Accel-erated ConditionsD4693 Test Method for Low-Temperature Torque of Grease-Lubricated Wheel Bearings2.2 SAE Standards:4AMS 3217A Standard Elastomer Stock-Test SlabsAMS 3217/2C Test Slabs,Acrylonitrile Butadiene(NBR-L)-Low Acrylonitrile,65-755AMS 3217/3B Test Slabs Chloroprene(CR)-65-75SAE J310 Automotive Lubricating Greases3.Terminology3.1 Definitions:3.1.1 lubricant,nany material interposed between twosurfaces that reduces the friction or wear between them.D41753.1.2 lubricating grease,na semi-fluid to solid product ofa dispersion of a thickener in a liquid lubricant.3.1.2.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immobilizes the liquid lubricant bysurface tension and other physical forces.Other ingredientsimparting special properties are often included.D2173.1.3 thickener,nin lubricating grease,a substance com-posed of finely-divided particles dispersed in a liquid to formthe products structure.