ASTM D7437-08(2013)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D7437 − 08 (Reapproved 2013)
Standard Test Method for
Temperature and Hard Water Stability of Engine Coolants
This standard is issued under the fixed designation D7437; 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 and the test solution is returned to an oven set at 90°C for 14
days.At the end of this period, the test engine coolant solution
1.1 This test method covers a simple glassware-type proce-
is removed, cooled, and inspected. The cooled sample is
dureforevaluatingtheeffectsoftemperatureandhardwateron
cenrifuged and any precipitate treated with methanol. The
the stability of engine coolants at elevated temperatures under
volume of any precipitate left after the methanol wash is
controlled laboratory conditions.
decanted is recorded.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information 4. Significance and Use
only.
4.1 4.1 This test method provides information on the stabil-
1.3 This standard does not purport to address all of the
ity of the engine coolant concentrate when stored at elevated
safety concerns, if any, associated with its use. It is the
temperatures for two weeks. These test conditions might
responsibility of the user of this standard to establish appro-
simulate the conditions that a product would be subjected to in
priate safety and health practices and determine the applica-
transit and storage in warehouses before delivery to the
bility of regulatory limitations prior to use.
customer.
4.2 Thistestmethodprovidesinformationonthestabilityof
2. Referenced Documents
an engine coolant diluted with synthetic hard water at elevated
2.1 ASTM Standards:
temperatures.Thistestmethodprovidesalaboratorymethodto
D1193 Specification for Reagent Water
test the sensitivity of the engine coolant to hard water.
D1176 Practice for Sampling and Preparing Aqueous Solu-
tions of Engine Coolants orAntirusts forTesting Purposes
5. Apparatus
E288 Specification for Laboratory Glass Volumetric Flasks
5.1 Graduated Cylinder—of capacity 50 6 0.50 mL.
2.2 British Standards:
5.2 Graduated Conical Centrifuge Tubes, of capacity 100
BS 5117-1.5:1992 Coolant Hard Water Stability Test
mL with stoppers.
BSI BS ISO 5725-2 Accuracy (Trueness and Precision) of
Measurement Methods and Results–Part 2: Basic Method
5.3 Forced Ventilation Oven, capable of being maintained at
for the Determination of Repeatability and Reproducibil-
temperatures of 60 6 2°C and 90 6 2°C.
ity of a Standard Measurement Method
5.4 Centrifuge—capable of generating a relative centrifugal
force of 900.
3. Summary of Test Method
Relative centrifugal force 5 ~v/1335! d (1)
3.1 A sample engine coolant concentrate is kept at 60°C in
a controlled oven for 14 days and then cooled to room
where:
temperature and inspected. Synthetic hard water is then added
v = rotational velocity (r/min) and,
d = diamter (mm) between the ends of the centrifuge tubes
at the point of maximum swing.
This test method is under the jurisdiction ofASTM Committee D15 on Engine
Coolants and Related Fluids and is the direct responsibility of Subcommittee
5.5 Pipette, of capacity 20 6 0.50 mL.
D15.06 on Glassware Performance Tests.
Current edition approved May 1, 2013. Published June 2013. Originally 5.6 Volumetric Balance, one-mark, 1000 mL (compliant
approved in 2008. Last previous edition approved in 2008 as D7437-08. DOI:
with Specification E288, Class B requirements).
10.1520/D7437-08R13.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Reagents and Materials
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
6.1 Purity of Reagents—Reagent grade chemicals shall be
the ASTM website.
used in all tests. Unless otherwise indicated, it is intended that
Orders for all British Standards Institution (BSI) International and foreign
all reagents conform to the specification of the Committee on
standards publications should be addressed to Customer Services, telephone:
020-8996 9001 and fax: 020 8996 7001. Analytical Reagents of the American Chemical Society where
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D7437 − 08 (2013)
such specifications are available. Other grades may be used, centrifugalforceof900,for15min.Carefullydecanttheliquor
provided it is first ascertained that the reagent is of sufficiently from any precipitate present at the bottom of the centrifuge
high purity to permit its use without lessening the accuracy of tubes.
the determination.
9.6 Using the 20-mL pipette, add 20 mL of the methanol to
6.2 Purity of Water—Unless otherwise indicated, references the precipitate in the centrifuge tubes and shake vigorously
to water shall be understood to mean reagent water as defined until the precipitate is dislodged to ensure thorough washing.
by Type IV of Specification D1193. Recentrifuge for 15 min. Decant the methanol from any
precipitate present at the bottom of the centrifuge tubes.
6.3 Synthetic Hard Water Stock Solution—Prepare a stock
solution by dissolving 44.10 g of calcium chloride dehydrate 9.7 Record the volume of an
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