ASTM_D_6660_-_01_2014e1.pdf

Designation:D666001(Reapproved 2014)1Standard Test Method forFreezing Point of Aqueous Ethylene Glycol Base EngineCoolants by Automatic Phase Transition Method1This standard is issued under the fixed designation D6660;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.1NOTEUnits information was corrected and Note 4 was changed to a warning statement and included in Section 7.3editorially in July 2014.1.Scope1.1 This test method covers the determination of the freez-ing point of an aqueous engine coolant solution.1.2 This test method is designed to cover ethylene glycolbase coolants up to a maximum concentration of 60%(v v)inwater;however,the ASTM interlaboratory study mentioned in12.2 has only demonstrated the test method with sampleshaving a concentration range of 40 to 60%(v/v)water.NOTE1Where solutions of specific concentrations are to be tested,they shall be prepared from representative samples as directed in TestMethod D1176.Secondary phases separating on dilution need not beseparated.NOTE2The products may also be marketed in a ready-to-use form(prediluted).1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.Some specifichazards statements are given in 7.3.2.Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesD1177 Test Method for Freezing Point of Aqueous EngineCoolantsD3306 Specification for Glycol Base Engine Coolant forAutomobile and Light-Duty ServiceD6210 Specification for Fully-Formulated Glycol Base En-gine Coolant for Heavy-Duty Engines3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 automatic phase transition method,nin thisstandard,the procedures of automatically cooling an enginecoolant sample until solid crystals appear,followed by con-trolled warming and recording the temperature at which thecrystals redissolve into the liquid phase.3.1.2 freezing point,nthe temperature at which crystalli-zation begins in the absence of supercooling,or the maximumtemperature reached immediately after initial crystal formationin the case of supercooling,or the temperature at which solidcrystals,formed on cooling,disappear when the temperature ofthe specimen is allowed to rise.3.1.3 peltier device,na solid state thermoelectric deviceconstructed with dissimilar semiconductor materials,config-ured in such a way that it will transfer heat to and away froma test specimen dependent on the direction of electric currentapplied to the device.4.Summary of Test Method4.1 A specimen is cooled by a Peltier device while continu-ously being illuminated by a light source.The specimen iscontinuously monitored by an array of optical detectors for thefirst formation of crystals.Once the crystals are formed,thespecimen is then warmed at controlled rates until all thecrystals return to the liquid phase.The detectors are sufficientin number to ensure that any crystals are detected.Thespecimen temperature at which the crystals return to the liquidphase is recorded by the temperature sensor as the freezingpoint.5.Significance and Use5.1 The freezing point of an engine coolant indicates thecoolant freeze protection.1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.03 on Physical Properties.Current edition approved July 1,2014.Published July 2014.Originally approvedin 2001.Last previous edition approved in 2007 as D6660 01(2007).DOI:10.1520/D6660-01R14E01.2For 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,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The freezing point of an engine coolant may be used todetermine the approximate glycol content,provided the glycoltype is known.5.3 Freezing point as measured by Test Method D1177 orapproved alternative method is a requirement in SpecificationsD3306 and D6210.5.4 This test method provides results that are equivalent toTest Method D1177 and expresses results to the nearest 0.1Cwith improved reproducibility over Test Method D1177.5.5 This test method determines the freezing point in ashorter period of time than Test Method D1177.5.6 Thi