ASTM_D_525_-_12a_2019.pdf

Designation:D52512a(Reapproved 2019)British Standard 4347Designation:40/97Standard Test Method forOxidation Stability of Gasoline(Induction Period Method)1This standard is issued under the fixed designation D525;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.Scope1.1 This test method covers the determination of the stabil-ity of gasoline in finished form only,under accelerated oxida-tion conditions.(WarningThis test method2is not intendedfor determining the stability of gasoline components,particu-larly those with a high percentage of low boiling unsaturatedcompounds,as these may cause explosive conditions withinthe apparatus.However,because of the unknown nature ofcertain samples,the pressure vessel assembly shall include asafety burst-disc in order to safeguard the operator.)NOTE1For measurement of oxidation stability of gasoline bymeasurement of potential gum,refer to Test Method D873,or IP TestMethod 138.NOTE2The precision data were developed with gasolines derivedfrom hydrocarbon sources only without oxygenates.1.2 The accepted SI unit of pressure is the kilo Pascal(kPa),and of temperature is C.1.3 WARNINGMercury has been designated by manyregulatory agencies as a hazardous substance that can causeserious medical issues.Mercury,or its vapor,has been dem-onstrated to be hazardous to health and corrosive to materials.Use Caution when handling mercury and mercury-containingproducts.See the applicable product Safety Data Sheet(SDS)for additional information.The potential exists that sellingmercury or mercury-containing products,or both,is prohibitedby local or national law.Users must determine legality of salesin their location.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 prior 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D873 Test Method for Oxidation Stability of Aviation Fuels(Potential Residue Method)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standards:4IP-138 Test Method for Oxidation Stability,Aviation Gaso-linePart IV Petroleum and its Products53.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 break point,nthe point in the pressure-time curvethat is preceded by a pressure drop of exactly 14 kPa within15 min and succeeded by a drop of not less than 14 kPa in15 min.3.1.2 induction period,nthe time elapsed between theplacing of the pressure vessel in the bath and the break point at100 C.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability,Cleanliness and Compatibility of Liquid Fuels.This test method has been approved by the sponsoring committees and acceptedby the Cooperating Societies in accordance with established procedures.Current edition approved Dec.1,2019.Published December 2019.Originallyapproved in 1939.Last previous edition approved in 2012 as D525 12a.DOI:10.1520/D0525-12AR19.2Further information can be found in the June 1978,January 1979,and June1986 editions of the Institute of Petroleum Review.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.4Available from Energy Institute,61 New Cavendish St.,London WIM,8ARU.K.5Aconvenient template for measuring the breakpoint is described in the paper byKorb,E.L.,“Induction Period Calculator,”ASTM Bulletin,No.153,August 1948,pp.99102.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(TBT)Committee.14.Summary of Test Method4.1 The sample is oxidized in a pressure vessel initiallyfilled at 15 C to