ASTM_D_7667_-_21.pdf

Designation:D766721Standard Test Method forDetermination of Corrosiveness to Silver by AutomotiveSpark-Ignition Engine FuelThin Silver Strip Method1This standard is issued under the fixed designation D7667;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 covers the determination of the corro-siveness to silver by automotive spark-ignition engine fuel(forexample,gasoline),as defined by Specification D4814 orsimilar specifications in other jurisdictions,having a vaporpressure no greater than 124 kPa(18 psi)at 37.8 C(100 F)by one of two procedures.1.1.1 Procedure AInvolves the use of a pressure vessel.1.1.2 Procedure BInvolves the use of a vented test tube.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.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:2D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD3241 Test Method for Thermal Oxidation Stability ofAviation Turbine FuelsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4814 Specification for Automotive Spark-Ignition EngineFuelE1 Specification for ASTM Liquid-in-Glass Thermometers2.2 Energy Institute Standards:3IP 227 Determination of Corrosiveness to Silver of AviationTurbine Fuels-Silver Strip Method2.3 ASTM Adjuncts:4Color standard for tube deposit rating(5 aluminum strips)3.Terminology3.1 Abbreviations:3.1.1 PTFEpolytetrafluoroethylene3.1.2 PVpressure vessel3.1.3 PVPpressure vessel procedure3.1.4 SSCDsilver strip centering device3.1.5 TSMDtemperature sensing and monitoring device3.1.6 VTTPvented test tube procedure4.Summary of Test Method4.1 A polished,thin silver strip is immersed in 30 mL of thesample being tested,and heated at 50 C(122 F)for 2 h.Atthe end of the heating period,the silver strip is removed,1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 2010.Last previous edition approved in 2015 as D7667 10(2015).DOI:10.1520/D7667-21.2For 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 Energy Institute,61 New Cavendish St.,London,WIG 7AR,U.K.,http:/www.energyinst.org.uk.4Available from ASTM International Headquarters.Order Adjunct No.ADJD3241.Original adjunct produced in 1986.*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?washed,and the color and tarnish level assessed against theSilver Strip Classifications in Table 1.5.Significance and Use5.1 Crude petroleum contains sulfur compounds,most ofwhich are removed during refining.However,of the sulfurcompounds remaining in the petroleum product or introducedinto the fuel during storage and distribution,some can have acorroding a