ASTM D4921-95(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D4921 − 95 (Reapproved 2012)
Standard Test Method for
Foaming Tendencies of Engine Coolants at Room
Temperature
This standard is issued under the fixed designation D4921; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 5.2 Water Bath—A water bath or equivalent device capable
of maintaining temperature at 20 6 1°C.
1.1 This test method applies to a simple shake test for
evaluating the tendency of an aqueous solution of engine
6. Reagents
coolant to foam at room temperature.
6.1 Deionized Water.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
7. Test Conditions
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7.1 TestTemperature—Thetestsolutionshallbemaintained
bility of regulatory limitations prior to use.
at 20 6 1°C for 30 min before shaking.
7.2 Shake Rate—The graduated cylinder containing the test
2. Referenced Documents
solution should be shaken vigorously for 30 s before a reading
2.1 ASTM Standards:
of the foam volume is taken.
D1176 Practice for Sampling and Preparing Aqueous Solu-
7.3 Number of Tests— Each test solution should be tested in
tions of Engine Coolants orAntirusts for Testing Purposes
triplicate, using a freshly prepared test solution for each test.
3. Summary of Test Method
8. Test Procedure
3.1 A30 % by volume coolant concentrate solution is pre-
8.1 Prepare three 50-mL samples of a 30 % by volume
pared in deionized water and shaken in a stoppered graduated
cylinder for 30 s. The volume of foam formed in the cylinder (15-mL) coolant solution in deionized water. Use 100-mL
graduated cylinders.
is read in millilitres. Preparation of the sample is done in
accordance with Test Method D1176.
8.2 The graduated cylinders should be stoppered and placed
in the constant 20 6 1°C temperature water bath. Ensure that
4. Significance and Use
the test solution is submerged below the water level.Allow the
4.1 The test method will generally identify coolants that
test solutions to equilibrate in the bath for 30 min.
have a tendency to foam excessively at room temperature.
8.3 Remove the graduated cylinder from the bath and shake
NOTE 1—In use, the foaming tendency of a coolant solution may be
vigorously (using forearm), making a 90° arc for approxi-
increased by service aging or contamination.
mately 30 s (use a stopwatch or timing device). To avoid
leakage of test contents from the cylinder, the stopper should
5. Apparatus
be held or locked in place.
5.1 Graduated Cylinders—100-mL graduated cylinders
3 NOTE 2—Secure the stopper on the graduated cylinder using thumb,
with plastic stoppers are preferred for ease of handling.
index finger, or suit
...