ASTM_D_4742_-_17.pdf

Designation:D474217Standard Test Method forOxidation Stability of Gasoline Automotive Engine Oils byThin-Film Oxygen Uptake(TFOUT)1This standard is issued under the fixed designation D4742;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 This test method evaluates the oxidation stability ofengine oils for gasoline automotive engines.This test,run at160 C,utilizes a high pressure reactor pressurized withoxygen along with a metal catalyst package,a fuel catalyst,andwater in a partial simulation of the conditions to which an oilmay be subjected in a gasoline combustion engine.This testmethod can be used for engine oils with viscosity in the rangefrom 4 mm2/s(cSt)to 21 mm2/s(cSt)at 100 C,includingre-refined oils.1.2 This test method is not a substitute for the engine testingof an engine oil in established engine tests,such as SequenceIIID.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 ExceptionPressure units are provided in psig,anddimensions are provided in inches in Annex A1,because theseare the industry accepted standard and the apparatus is builtaccording to the figures shown.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 and health practices and determine the applica-bility of regulatory limitations prior to use.For specificwarning statements,see Sections 7 and 8.1.5 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A314 Specification for Stainless Steel Billets and Bars forForgingB211 Specification for Aluminum and Aluminum-AlloyRolled or Cold Finished Bar,Rod,and WireD664 Test Method for Acid Number of Petroleum Productsby Potentiometric TitrationD1193 Specification for Reagent WaterD2272 Test Method for Oxidation Stability of Steam Tur-bine Oils by Rotating Pressure VesselD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE1 Specification for ASTM Liquid-in-Glass Thermometers3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 break pointthe precise point of time at which rapidoxidation of the oil begins.3.1.2 oxidation induction timethe time until the oil beginsto oxidize at a relatively rapid rate as indicated by the decreaseof oxygen pressure.3.1.3 oxygen uptakeoxygen absorbed by oil as a result ofoil oxidation.4.Summary of Test Method4.1 The test oil is mixed in a glass container with three otherliquids that are used to simulate engine conditions:(1)anoxidized/nitrated fuel component(Annex A2),(2)a mixture ofsoluble metal naphthenates(lead,copper,iron,manganese,andtin naphthenates(Annex A3),and(3)Type I reagent water.4.2 The glass container holding the oil mixture is placed ina high pressure reactor equipped with a pressure gauge.Thehigh pressure reactor is sealed,charged with oxygen to apressure of 620 kPa(90 psig),and placed in an oil or dry1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.09.0G on Oxidation Testing of Engine Oils.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1988.Last previous edition approved in 2016 as D4742 16.DOI:10.1520/D4742-17.2For 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 bath3,4at 160 C at an angle of 30 from the horizontal.Thehigh pressure reactor is rotated axially at a speed of 100 r minforming a thin film of oil within the glass container resulting ina relatively large oil-oxygen contact area.NOTE1A pressure sensing device can be used in place of a pressuregauge.4.3 The pressure of the high pressure reactor is recordedcontinuously from the beginning