ASTM_D_2625_-_20.pdf

Designation:D262520Standard Test Method forEndurance(Wear)Life and Load-Carrying Capacity of SolidFilm Lubricants(Falex Pin and Vee Method)1This standard is issued under the fixed designation D2625;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method(see Note 1)covers the determinationof the endurance(wear)life and load-carrying capacity of drysolid film lubricants in sliding steel-on-steel applications.NOTE1Reference may be made to Coordinating Research Council,Inc.(CRC)Report No.419,“Development of Research Technique forMeasuring Wear Life of Bonded Solid Lubricant Coatings for Airframes,Using the Falex Tester.”See also SAE Aerospace Standard AS5272.1.2 The values stated in SI units are to be regarded as thestandard except where equipment is supplied using inch-poundunits and would then be regarded as standard.The metricequivalents of inch-pound units given in such cases in the bodyof the standard may be approximate.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 standard 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 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:2B16/B16M Specification for Free-Cutting Brass Rod,Barand Shapes for Use in Screw MachinesF22 Test Method for Hydrophobic Surface Films by theWater-Break Test2.2 U.S.Military Specifications:3MIL-DTL-16232 Phosphate Coatings,Heavy,Manganese orZinc Base2.3 Other Standards:42USC7671a Clean Air Act Amendments of 19904SAE AS5272 Lubricant,Solid Film,Heat Cured,CorrosionInhibiting,Procurement Specification53.Terminology3.1 Definitions:3.1.1 dry solid film lubricants,ndry coatings consisting oflubricating powders in a solid matrix bonded to one or bothsurfaces to be lubricated.3.2 Definitions of Terms Specific to This Standard:3.2.1 direct load,nthe load that is applied linearly,bisect-ing the angle of the vee block corrected to either the 800 lbf(3550 N)gauge reference or the 3000 lbf(13 300 N)gaugereference.3.2.1.1 DiscussionThis load is equivalent to the true loadtimes the cos 42.3.2.2 endurance(wear)life,nthe length of test timebefore failure under a constant loaded condition,in minutes,inwhich the applied test lubricant performs its function.3.2.3 gauge load,nthe value obtained from the gaugewhile running the test after being corrected to the standardcurve using the calibration procedure for the 4500 lbf(20 000 N)reference gauge.3.2.3.1 DiscussionThe gauge reading is irrespective of theparticular gauge used,and corrections are made by comparisonto the Brinell ball impression diameters on a standard reference1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.05 on Solid Lubricants.Current edition approved Sept.1,2020.Published October 2020.Originallyapproved in 1967.Last previous edition approved in 2015 as D2625 94(2015).DOI:10.1520/D2625-20.2For 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.3Available from https:/quicksearch.dla.mil/qsSearch.aspx.4Available from U.S.Environmental Protection Agency,http:/epa.gov.5Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096,http:/www.sae.org.*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 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(TBT)Committee.copper test coupon with a Rockwell hardness range of HB 37to HB 39.An electronic calibration instrument6is availablewhich can be used in place of the copper coupon.3.2.4 load carrying capacity,nthe highest indicated loadsustained for a minimum of 1 min.4.Summary of Test Method4.1 The endurance test(Procedure A)consists of runn