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Designation: D4725 − 15Standard Terminology forEngine Coolants and Related Fluids 1This standard is issued under the f i xed 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 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 provide auniform set of def i nitions for use in preparing ASTMspecif i cations, 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 safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards: 2D1193 Specif i cation for Reagent WaterD3306 Specif i cation for Glycol Base Engine Coolant forAutomobile and Light-Duty ServiceD3585 Specif i cation for ASTM Reference Fluid for CoolantTestsD4985 Specif i cation for Low Silicate Ethylene Glycol BaseEngine Coolant for Heavy Duty Engines Requiring aPre-Charge of Supplemental Coolant Additive (SCA)D6210 Specif i cation for Fully-Formulated Glycol Base En-gine Coolant for Heavy-Duty EnginesD6471 Specif i cation for Recycled Prediluted Aqueous Gly-col Base Engine Coolant (50 Volume % Minimum) forAutomobile and Light-Duty ServiceD6472 Specif i cation for Recycled Glycol Base Engine Cool-ant Concentrate for Automobile and Light-Duty ServiceE1177 Specif i cation for Engine Coolant Grade Glycol2.2 ISO Standard:ISO 22241 Diesel engines - NOx reduction agent AUS 323. Terminologyantifoam, n—a substance added to engine coolant concentrate,corrosion inhibitor packages, or supplemental coolant addi-tives to prevent or suppress foam.D ISCUSSION —Eliminating foam improves heat transfer.antifreeze, n—a term frequently used in the marketplace forengine coolant concentrate. (See engine coolant concen-trate.)antirust, n—an 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, n—the residue from an engine coolantconcentrate, antirust, or engine coolant that remains afterevaporation, charring, and ignition at strong heat.boiling point, n—the temperature at which the vapor pressureof an engine coolant reaches atmospheric pressure underequilibrium boiling conditions.cavitation corrosion, n—a form of localized, acceleratedcorrosion characterized by deep pitting and caused by highmechanical forces resulting from coolant vapor bubblecollapse at the surface of the metal.cavitation erosion corrosion, n—the mechanical removal ofprotective f i lms on metal by the formation and collapse ofvapor bubbles in a liquid, and the abrasive action of a liquid,which may contain suspended solids, moving at high veloc-ity.D ISCUSSION —The mechanical removal of the protective f i lms exposesfresh metal to corrosive attack.coolant additive package, n—the combination of inhibitorsadded to an engine coolant to mitigate cooling systemdegradation, corrosion, scaling, and foaming, or to provideother desirable properties.corrosion inhibitor package, n—the combination of inhibitorsadded to an engine coolant to mitigate cooling systemcorrosion.corrosive water, n—a standard solution containing 100 ppmeach of sulfate, chloride, and bicarbonate ions introduced asthe sodium salts to distilled water.1 This 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 2013 as D4725 – 13. DOI:10.1520/D4725-15.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1