ASTM_D_5931_-_20.pdf

Designation:D593120Standard Test Method forDensity and Relative Density of Engine CoolantConcentrates and Aqueous Engine Coolants by DigitalDensity Meter1This standard is issued under the fixed designation D5931;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.Scope*1.1 This test method covers the determination of the densityor relative density of glycols,glycerin,heat transfer fluids,engine coolant concentrates,and aqueous engine coolants.1.2 This test method should not be applied to samples sodark in color that the absence of air bubbles in the sample cellcannot be established with certainty.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 The accepted units of measure for density are gramsper milliliter or kilograms per cubic meter.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see 7.4.1.5 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE230/E230M Specification for Temperature-ElectromotiveForce(emf)Tables for Standardized Thermocouples3.Terminology3.1 Definitions:3.1.1 relative density,nthe ratio of the density of amaterial at a stated temperature to the density of water at thesame stated temperature.4.Summary of Test Method4.1 A small volume of liquid sample is introduced into anoscillating sample tube,and the change in oscillating frequencycaused by the change in the mass of the tube is used inconjunction with calibration data to determine the density ofthe sample.5.Significance and Use5.1 Density is a fundamental physical property that can beused in conjunction with other properties to characterize enginecoolant concentrates and aqueous engine coolants.5.2 Determination of the density or relative density of theseproducts is necessary for the conversion of measured volumesto volumes at the standard temperature of choice.ASTMspecifications normally state the temperatures for density andrelative density of fluids;25 C,20 C,and 15.6 C arecommonly used temperatures.6.Apparatus6.1 Digital Density Analyzer,consisting of a U-shaped,oscillating sample tube and a system for electronic excitation,frequency counting,and display.The analyzer must accommo-date the accurate measurement of the sample temperatureduring measurement or must control the sample temperature asdescribed in 6.2.The instrument must meet the precisionrequirements described in this test method.6.2 Circulating ConstantTemperature Bath,(optional)ca-pable of maintaining the temperature of the circulating liquidconstant to 60.05 C in the desired range.Temperature controlcan be maintained as part of the density analyzer instrumentpackage.6.3 Syringes,at least 2 mL in volume with a tip or anadapter tip that will fit the opening of the oscillating tube.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 May 15,2020.Published June 2020.Originallyapproved in 1996.Last previous edition approved in 2017 as D593113(2017).DOI:10.1520/D5931-20.2For 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.*A Summary of 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 Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.6.4 Flow-Through or Pressure Adapter,for use as an alter-native means of introducing the sample into the densityanalyzer either by a pump or by vacuum.6.5 Temperature Measuring Instrument,(Environmentallysafe thermometer or thermocouple)capable of monitoring theobserved test temperature to within an accuracy of 60.05 C,Specif