1、Designation:D666001(Reapproved 2019)Standard 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 adop
2、tion 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 test method covers the determination of the freez-ing point of an aqueous
3、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)wate
4、r.NOTE1Where solutions of specific concentrations are to be tested,they shall be prepared from representative samples as directed in PracticeD1176.Secondary phases separating on dilution need not be separated.NOTE2The products may also be marketed in a ready-to-use form(prediluted).1.3 The values st
5、ated 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,healt
6、h,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Some specific hazards statements are given in 7.3.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decis
7、ion 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:2D1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAnti
8、rusts 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 Te
9、rms 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
10、 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 s
11、pecimen 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 o
12、f 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 unti
13、l 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
14、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 April 1,2019.Published April 2019.
15、Originallyapproved in 2001.Last previous edition approved in 2014 as D666001(2014)e1.DOI:10.1520/D6660-01R19.2For 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 standard
16、s Document Summary page onthe ASTM website.Copyright 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 5.2 The freezing point of an engi
