ASTM D4921-95(2000)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D4921–95 (Reapproved 2000)
Standard Test Method for
Foaming Tendencies of Engine Coolants at Room
Temperature
This standard is issued under the fixed designation D 4921; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 6. Reagents
1.1 This test method applies to a simple shake test for 6.1 Deionized Water.
evaluating the tendency of an aqueous solution of engine
7. Test Conditions
coolant to foam at room temperature.
7.1 Test Temperature— The test solution shall be main-
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the tained at 20 6 1°C for 30 min before shaking.
7.2 Shake Rate—The graduated cylinder containing the test
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- solution should be shaken vigorously for 30 s before a reading
of the foam volume is taken.
bility of regulatory limitations prior to use.
7.3 NumberofTests— Each test solution should be tested in
2. Referenced Documents
triplicate, using a freshly prepared test solution for each test.
2.1 ASTM Standards:
8. Test Procedure
D 1176 Test Method for Sampling and Preparing Aqueous
8.1 Prepare three 50-mL samples of a 30 % by volume
Solutions of Engine Coolants or Antirusts for Testing
Purposes (15-mL) coolant solution in deionized water. Use 100-mL
graduated cylinders.
3. Summary of Test Method
8.2 The graduated cylinders should be stoppered and placed
3.1 A 30 % by volume coolant concentrate solution is in the constant 20 6 1°C temperature water bath. Ensure that
prepared in deionized water and shaken in a stoppered gradu- the test solution is submerged below the water level.Allow the
ated cylinder for 30 s. The volume of foam formed in the test solutions to equilibrate in the bath for 30 min.
cylinder is read in millilitres. Preparation of the sample is done 8.3 Remove the graduated cylinder from the bath and shake
in accordance with Test Method D 1176. vigorously (using forearm), making a 90° arc for approxi-
mately 30 s (use a stopwatch or timing device). To avoid
4. Significance and Use
leakage of test contents from the cylinder, the stopper should
4.1 The test method will generally identify coolants that be held or locked in place.
have a tendency to foam excessively at room temperature.
NOTE 2—Secure the stopper on the graduated cylinder using thumb,
index finger, or suitable locking device.
NOTE 1—In use, the foaming tendency of a coolant solution may be
increased by service aging or contamination.
...