1、Designation:D468218Standard Specification forMiscibility with Gasoline and Fluidity of Two-Stroke-CycleGasoline Engine Lubricants1This standard is issued under the fixed designation D4682;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisi
2、on,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 specification covers four categories of lubricantsintended for use in two-stroke-cycle spark-ignition
3、gasolineengines based on their miscibility with gasoline and theirlow-temperature fluidity.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The following safety hazards caveat pertains only to thetest methods described in
4、this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prio
5、r 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 TechnicalBar
6、riers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D97 Test Method for Pour Point of Petroleum ProductsD439 Specification for Automotive Gasoline(Withdrawn1990)3D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D874 Te
7、st Method for Sulfated Ash from Lubricating Oilsand AdditivesD2983 Test Method for Low-Temperature Viscosity of Au-tomatic Transmission Fluids,Hydraulic Fluids,and Lubri-cants using a Rotational Viscometer3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fluidity,nof two-stroke-c
8、ycle gasoline enginelubricants,following industry practice,this term is used todesignate the absolute viscosity in millipascalseconds(centi-poises)of the lubricant under test.In general usage,fluidity isthe reciprocal of absolute viscosity.3.1.2 miscibility,nof two-stroke-cycle gasoline enginelubric
9、ants,an inverse function of the time required for a fueland lubricant introduced into the apparatus as separate phasesto produce a single-phase mixture by agitation under controlledconditions.4.Classification4.1 The candidate oils are classified into Categories 1through 4 according to the temperatur
10、e at which the tests areconducted;respectively,0 C,10 C,25 C,and 40 C.Each category has its own reference oil that is the same forboth the miscibility and fluidity tests.5.Qualification Requirements5.1 MiscibilityWhen tested in accordance with Section 6,candidate oils that mix with the gasoline in n
11、ot more than110%of the number of inversions of the apparatus required tomix the reference oil,and that do not separate on standing,qualify as miscible.5.2 FluidityWhen tested in accordance with Section 7,candidate oils meet the requirements for fluidity if theirviscosity is not more than 10%higher t
12、han that of thereference oil.TEST METHODS6.Miscibility Test Method6.1 Summary of Test MethodThe candidate oil and gaso-line are placed as separate phases in a stoppered-glass cylinder1This specification is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants
13、and is the direct responsibility ofSubcommittee D02.B0.07 on Development and Surveillance of Bench TestsMethods.Current edition approved July 1,2018.Published August 2018.Originallyapproved in 1987.Last previous edition approved in 2013 as D4682 13.DOI:10.1520/D4682-18.2For referenced ASTM standards
14、,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.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary o
15、f 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 De
16、cision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 and mixed by end-over-end rotation of the cylinder undercontrolled conditions at the temperature appropriate to thecategory of the oil.NOTE1This procedure specifies that the lubricant be mixed withgasoline.Some fuels in current use are partially or predominatelycomposed of oxygenated compounds such as alcohols,and some lu
