1、Designation:D472515Standard Terminology forEngine Coolants and Related Fluids1This standard is issued under the fixed designation D4725;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
2、 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This document covers terminology relating to enginecoolants.It is intended to provide a reference for anyoneseeking information on engine coolants,and also to p
3、rovide auniform set of definitions for use in preparing ASTMspecifications,test methods and other standard documents.1.2 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 s
4、afety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3306 Specification for Glycol Base Engine Coolant forAutomobile and Light-Duty ServiceD3585 Specification for ASTM Refere
5、nce Fluid for CoolantTestsD4985 Specification for Low Silicate Ethylene Glycol BaseEngine Coolant for Heavy Duty Engines Requiring aPre-Charge of Supplemental Coolant Additive(SCA)D6210 Specification for Fully-Formulated Glycol Base En-gine Coolant for Heavy-Duty EnginesD6471 Specification for Recyc
6、led Prediluted Aqueous Gly-col Base Engine Coolant(50 Volume%Minimum)forAutomobile and Light-Duty ServiceD6472 Specification for Recycled Glycol Base Engine Cool-ant Concentrate for Automobile and Light-Duty ServiceE1177 Specification for Engine Coolant Grade Glycol2.2 ISO Standard:ISO 22241 Diesel
7、engines-NOx reduction agent AUS 323.Terminologyantifoam,na substance added to engine coolant concentrate,corrosion inhibitor packages,or supplemental coolant addi-tives to prevent or suppress foam.DISCUSSIONEliminating foam improves heat transfer.antifreeze,na term frequently used in the marketplace
8、 forengine coolant concentrate.(See engine coolant concen-trate.)antirust,nan inhibitor package,solid or liquid,intended tobe diluted with water or glycol for use in an engine coolingsystem to mitigate rust and corrosion.ash content,nthe residue from an engine coolantconcentrate,antirust,or engine c
9、oolant that remains afterevaporation,charring,and ignition at strong heat.boiling point,nthe temperature at which the vapor pressureof an engine coolant reaches atmospheric pressure underequilibrium boiling conditions.cavitation corrosion,na form of localized,acceleratedcorrosion characterized by de
10、ep pitting and caused by highmechanical forces resulting from coolant vapor bubblecollapse at the surface of the metal.cavitation erosion corrosion,nthe mechanical removal ofprotective films on metal by the formation and collapse ofvapor bubbles in a liquid,and the abrasive action of a liquid,which
11、may contain suspended solids,moving at high veloc-ity.DISCUSSIONThe mechanical removal of the protective films exposesfresh metal to corrosive attack.coolant additive package,nthe combination of inhibitorsadded to an engine coolant to mitigate cooling systemdegradation,corrosion,scaling,and foaming,
12、or to provideother desirable properties.corrosion inhibitor package,nthe combination of inhibitorsadded to an engine coolant to mitigate cooling systemcorrosion.corrosive water,na standard solution containing 100 ppmeach of sulfate,chloride,and bicarbonate ions introduced asthe sodium salts to disti
13、lled water.1This terminology is under the jurisdiction ofASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.92 on Terminology.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1987.Last previous edition approved in 2
14、013 as D4725 13.DOI:10.1520/D4725-15.2For 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.Copyright ASTM International,
15、100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 diesel exhaust fluid(DEF),npreparation of aqueous urea(NH2)2CO,containing 32.5%by weight of technicallypure urea in high-purity water with quality characteristicsdefined by ISO 22241.dye,na colorant added to an engine c
16、oolant to give it adistinctive color.engine coolant,na fluid used to transfer heat from an engineto the radiator,usually containing specific amounts ofglycols,water,corrosion inhibitors,and a foam supressor.DISCUSSIONEngine coolants may also contain supplemental coolantadditives.engine coolant concentrate,na formulated liquid productintended to be diluted with water for use in engine coolingsystems.DISCUSSIONFunctionally,the product provides a lower freeze pointand mitigates corrosion and foamin
