1、Designation:D784012(Reapproved 2017)Standard Test Method forFoaming Tendencies of Non-Aqueous Engine Coolants inGlassware1This standard is issued under the fixed designation D7840;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
2、ear 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 a simple glassware test forevaluating the tendency of non-aqueous engine coolants tofoam und
3、er laboratory controlled conditions of aeration andtemperature.1.2 UnitsThe values stated in SI units are to be regardedas the standard.No other units of measurement are included inthis standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It
4、 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.For specificwarning statements,see 7.2 and 7.3.1.4 This international standard was developed in accor-dance with internatio
5、nally 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 Specific
6、ation for Reagent WaterE1 Specification for ASTM Liquid-in-Glass ThermometersE128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory UseE230/E230M Specification and Temperature-ElectromotiveForce(emf)Tables for Standardized Thermocouples3.Terminology3.1 De
7、finitions of Terms Specific to This Standard:3.1.1 break time,ntime required for the foam to collapse(after the air supply has been shut off)to the first appearance ofan“eye”on the surface of the test solution.3.1.2 eye,nappearance of foam-free area on the surface ofthe test coolant surrounded by a
8、ring of foam clinging to thecylinder walls.4.Summary of Test Method4.1 The non-aqueous coolant of interest is blown with air ata constant rate for 5 min while maintained at a constanttemperature of 88 6 1 C by means of a suitable temperaturebath.The volume of foam and the time for such foam to break
9、are measured.5.Significance and Use5.1 In the test method,coolants generally will be distin-guished that have a tendency to foam excessively from thosethat are suitable for further evaluation to determine perfor-mance in actual service.NOTE1In use,the foaming tendency of a coolant solution may beinc
10、reased by service aging or contamination.A properly functioningpressure cap will tend to suppress foaming in coolant solutions.6.Apparatus6.1 Container,a 500-mL graduated container of heat-resistant glass having a diameter of 45 to 50 mm and a lengthof 380 mm.6.2 Temperature Bath,a heat-resistant gl
11、ass container largeenough to permit immersion of the graduated container at leastto the 350-mL graduation mark.A 4000-mL beaker is satisfac-tory.6.3 Heat Source,any heating system capable of maintaininga uniform bath temperature of 61 C.A 750-W electric hotplate is satisfactory.6.4 Aerator Tube,a 25
12、.4-mm diameter spherical gas-diffuser stone3made of fused crystalline alumina grain thatmeets the following specifications when tested in accordancewith the method given in Annex A1:1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the dire
13、ct responsibility of SubcommitteeD15.22 on Non-Aqueous Coolants.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 2012.Last previous edition approved in 2012 as D7840-12.DOI:10.1520/D7840-12R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontac
14、t ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3For information on aerator supplier and specifications,contactASTM Subcom-mittee D15.06 through ASTM International Headquarters.Copyright AS
15、TM 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 Standard
16、s,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 Maximum pore diameter,mNot greater than 80Permeability at a pressure of 2.45 kPa,mL of air/min3000 to 64006.5 Temperature Measuring Instrument(EnvironmentallySafe Thermometer or Thermocouple)An ASTM Partial Im-mersion Temperature Measuring Instrument having a rangefrom 20 to 150 C(0 to 302 F)and conforming to therequirements for Thermometer 1C(1F),as prescribed inSpecification E1 or Th
