ASTM_D_2893_-_19.pdf

Designation:D289319Standard Test Methods forOxidation Characteristics of Extreme-Pressure LubricationOils1This standard is issued under the fixed designation D2893;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.1.Scope*1.1 These test methods(Aand B)cover the determination ofthe oxidation characteristics of extreme-pressure fluidlubricants,gear oils,or mineral oils.NOTE1The changes in the lubricant resulting from these test methodsare not always necessarily associated with oxidation of the lubricant.Some changes may be due to thermal degradation.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2D91 Test Method for Precipitation Number of LubricatingOilsD445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D943 Test Method for Oxidation Characteristics of InhibitedMineral OilsE1 Specification for ASTM Liquid-in-Glass ThermometersE2877 Guide for Digital Contact Thermometers3.Summary of Test Method3.1 The oil sample is subjected to a temperature of 95 C(Test Method A)or 121 C(Test Method B)in the presence ofdry air for 312 h.3.2 The oil is then tested for precipitation number andincrease in kinematic viscosity.4.Significance and Use4.1 These test methods have been widely used to measurethe oxidation stability of extreme pressure lubricating fluids,gear oils,and mineral oils.5.Apparatus5.1 Heating Bath or Block,thermostatically controlled,capable of maintaining the oil sample in the test tube at atemperature of 95 C 6 0.2 C(Test Method A),or 121 C 61.0 C(Test Method B)and large enough to hold the desirednumber of oxidation cells immersed in the heating bath orblock to a depth of approximately 350 mm.The liquid heatingbath shall be fitted with a suitable stirring device to provide auniform temperature throughout the bath.5.2 Test Tubes,of borosilicate glass,41 mm 6 0.5 mminside diameter and 600 mm in length are required,each fittedwith a slotted cork(Note 2)stopper into which shall be inserteda glass air delivery tube of 4 mm to 5 mm of inside diameter.The length of the air delivery tube shall be such that one endreaches to within 6 mm of the bottom of the tube and the otherend projects 60 mm to 80 mm from the cork stopper.NOTE2New corks should be used for each run.5.3 Flowmeter,one to each test tube,capable of measuringan air flow of 10 L/h with an accuracy of 6 0.5 L/h.5.4 ThermometerASTM Solvent Distillation Thermom-eter having a range from 76 C to 126 C and conforming tothe requirement for Thermometer 40C as prescribed in Speci-fication E1.Alternatively,calibrated digital contact thermom-eters such as PRTs(platinum resistance thermometers),thermistors,or thermocouples in accordance with Guide E2877of equal or better accuracy may be used.1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.09.0D on Oxidation of Lubricants.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1970.Last previous edition approved in 2014 as D2893 04(2014).DOI:10.1520/D2893-19.2For 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 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.1 5.5 Air SupplyOil-free,dried air at constant pressure shallbe supplied to each flowmeter.5.6 Air DryerBefore being supplied to the flowmeters,theair shall be passed through a drying tower pac