ASTM D4921-1995(2012) Standard Test Method for Foaming Tendencies of Engine Coolants at Room Temperature《室温下发动机冷却剂发泡倾向的标准试验方法》.pdf
《ASTM D4921-1995(2012) Standard Test Method for Foaming Tendencies of Engine Coolants at Room Temperature《室温下发动机冷却剂发泡倾向的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4921-1995(2012) Standard Test Method for Foaming Tendencies of Engine Coolants at Room Temperature《室温下发动机冷却剂发泡倾向的标准试验方法》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
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
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