1、Designation: D4921 95 (Reapproved 2012)Standard Test Method forFoaming Tendencies of Engine Coolants at RoomTemperature1This standard is issued under the fixed designation D4921; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、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 applies to a simple shake test forevaluating the tendency of an aqueous solution of enginecoo
3、lant to foam at room temperature.1.2 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 limitat
4、ions prior to use.2. Referenced Documents2.1 ASTM Standards:2D1176 Practice for Sampling and Preparing Aqueous Solu-tions of Engine Coolants or Antirusts for Testing Purposes3. Summary of Test Method3.1 A30 % by volume coolant concentrate solution is pre-pared in deionized water and shaken in a stop
5、pered graduatedcylinder for 30 s. The volume of foam formed in the cylinderis read in millilitres. Preparation of the sample is done inaccordance with Test Method D1176.4. Significance and Use4.1 The test method will generally identify coolants thathave a tendency to foam excessively at room tempera
6、ture.NOTE 1In use, the foaming tendency of a coolant solution may beincreased by service aging or contamination.5. Apparatus5.1 Graduated Cylinders100-mL graduated cylinderswith plastic stoppers are preferred for ease of handling.35.2 Water BathA water bath or equivalent device capableof maintaining
7、 temperature at 20 6 1C.6. Reagents6.1 Deionized Water.7. Test Conditions7.1 Test Temperature The test solution shall be maintainedat 20 6 1C for 30 min before shaking.7.2 Shake RateThe graduated cylinder containing the testsolution should be shaken vigorously for 30 s before a readingof the foam vo
8、lume is taken.7.3 Number of Tests Each test solution should be tested intriplicate, using a freshly prepared test solution for each test.8. Test Procedure8.1 Prepare three 50-mL samples of a 30 % by volume(15-mL) coolant solution in deionized water. Use 100-mLgraduated cylinders.8.2 The graduated cy
9、linders should be stoppered and placedin the constant 20 6 1C temperature water bath. Ensure thatthe test solution is submerged below the water level. Allow thetest solutions to equilibrate in the bath for 30 min.8.3 Remove the graduated cylinder from the bath and shakevigorously (using forearm), ma
10、king a 90 arc for approxi-mately 30 s (use a stopwatch or timing device). To avoidleakage of test contents from the cylinder, the stopper shouldbe held or locked in place.NOTE 2Secure the stopper on the graduated cylinder using thumb,index finger, or suitable locking device.8.4 Place cylinder on a l
11、evel surface and allow it to standundisturbed for 10 s.8.5 Record the foam volume to the nearest millilitre byreading the top level of foam and subtracting 50 mL to accountfor the liquid level.9. Report9.1 Report foam volumes (to the nearest 1.0 mL) for eachtest as well as the average of the tests.1
12、This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.06 on Glassware Performance Tests.Current edition approved Oct. 1, 2012. Published November 2012. Originallyapproved in 1989. Last previous editio
13、n approved in 2006 as D4921 95(2006).DOI: 10.1520/D4921-95R12.2For 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
14、.3Kimax or Pyrex brands have been found to be suitable.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States110. Precision and Bias10.1 Precision:10.1.1 Repeatability of the results within a given laboratoryis normally within 15 % of the me
15、an.10.1.2 Reproducibility among different laboratories is nor-mally within 30 % of the mean.10.2 BiasSince there is no accepted reference materialsuitable for determining the bias for the procedure in this testmethod, no statement of bias is being made.11. Keywords11.1 aqueous solutions; engine cool
16、ant; foam; foam test;foaming tendenciesASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the
17、riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of
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19、ke your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D4921 95 (2012)2
