1、Designation:D784012Standard 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 year of last revis
2、ion.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 under laboratory con
3、trolled 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 is theresponsibi
4、lity 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 7.3.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE1 Specificati
5、on for ASTM Liquid-in-Glass ThermometersE128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory UseE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples3.Terminology3.1 Definitions of Terms Specific to This Standa
6、rd: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 ring of foam clinging to thecylinder walls
7、.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 1C by means of a suitable temperaturebath.The volume of foam and the time for such foam to breakare measured.5.Significance and Use5.1 In t
8、he 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 beincreased by service aging or contamination.A
9、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 glass container largeenough to permit immersi
10、on 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 61C.A 750-W electric hotplate is satisfactory.6.4 Aerator Tube,a 25.4-mm diameter spherical gas-diffuser stone3
11、made of fused crystalline alumina grain thatmeets the following specifications when tested in accordancewith the method given in Annex A1: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
12、 Thermometer or Thermocouple)An ASTM Partial Im-mersion Temperature Measuring Instrument having a rangefrom20 to 150C(0 to 302F)and conforming to the1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of Subcommittee
13、D15.22 on Non-Aqueous Coolants.Current edition approved Dec.1,2012.Published January 2013.DOI:10.1520/D7840-12.2For 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 standa
14、rds Document Summary page onthe ASTM website.3For information on aerator supplier and specifications,contactASTM Subcom-mittee D15.06 through ASTM International Headquarters.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 requirements for
15、 Thermometer 1C(1F),as prescribed inSpecification E1 or Thermocouple as summarized in Specifi-cation E230.6.6 Air Supply,a clean and dry source,free from grease andother contaminants,capable of maintaining the prescribed flowrate through the diffuser stone.6.7 Timer,a stop watch or suitable timing d
16、evice accurate to60.2 s.6.8 Vent,a three-way stopcock inserted in the metered airsupply line immediately ahead of the aerator tube.6.9 Typical Assembly Setup,A typical apparatus using ahot-plate heat source is shown in Fig.1.7.Reagents and Materials7.1 Purity of WaterUnless otherwise indicated,referencesto water means reagent water as defined by Type II ofSpecification D1193.7.2 Acetone,for flushing and drying the test equipment.(WarningAcetone is extremely flammable.)7.3 Cleaning BathRefers to
