ASTM D7437-08

Standard Test Method for Temperature and Hard Water Stability of Engine Coolants

SIGNIFICANCE AND USE
4.1 This test method provides information on the stability of the engine coolant concentrate when stored at elevated temperatures for two weeks. These test conditions might simulate the conditions that a product would be subjected to in transit and storage in warehouses before delivery to the customer.  
This test method provides information on the stability of an engine coolant diluted with synthetic hard water at elevated temperatures. This test method provides a laboratory method to test the sensitivity of the engine coolant to hard water.
SCOPE
1.1 This test method covers a simple glassware-type procedure for evaluating the effects of temperature and hard water on the stability of engine coolants at elevated temperatures under controlled laboratory conditions.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Oct-2008
• ICS: 71.100.45 - Refrigerants and antifreezes
• Technical Committee: D15 - Engine Coolants and Related Fluids
• Drafting Committee: D15.06 - Glassware Performance Tests

Relations

• Replaced By: ASTM D7437-08(2013) - Standard Test Method for Temperature and Hard Water Stability of Engine Coolants
• Effective Date: 01-May-2013

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7437 − 08
StandardTest 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 days.At the end of this period, the test engine coolant solution
is removed, cooled, and inspected. The cooled sample is
1.1 This test method covers a simple glassware-type proce-
cenrifuged and any precipitate treated with methanol. The
dureforevaluatingtheeffectsoftemperatureandhardwateron
volume of any precipitate left after the methanol wash is
the stability of engine coolants at elevated temperatures under
decanted is recorded.
controlled laboratory conditions.
1.2 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 4.1 This test method provides information on the stabil-
only.
ity of the engine coolant concentrate when stored at elevated
1.3 This standard does not purport to address all of the
temperatures for two weeks. These test conditions might
safety concerns, if any, associated with its use. It is the
simulate the conditions that a product would be subjected to in
responsibility of the user of this standard to establish appro-
transit and storage in warehouses before delivery to the
priate safety and health practices and determine the applica-
customer.
bility of regulatory limitations prior to use.
4.2 Thistestmethodprovidesinformationonthestabilityof
2. Referenced Documents an engine coolant diluted with synthetic hard water at elevated
temperatures.Thistestmethodprovidesalaboratorymethodto
2.1 ASTM Standards:
test the sensitivity of the engine coolant to hard water.
D1193 Specification for Reagent Water
D1176 Practice for Sampling and Preparing Aqueous Solu-
5. Apparatus
tions of Engine Coolants orAntirusts forTesting Purposes
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
5.3 Forced Ventilation Oven, capable of being maintained at
Measurement Methods and Results–Part 2: Basic Method
temperatures of 60 6 2°C and 90 6 2°C.
for the Determination of Repeatability and Reproducibil-
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
where:
a controlled oven for 14 days and then cooled to room
temperature and inspected. Synthetic hard water is then added v = rotational velocity (r/min) and,
d = diamter(mm)betweentheendsofthecentrifugetubesat
and the test solution is returned to an oven set at 90°C for 14
the point of maximum swing.
5.5 Pipette, of capacity 20 6 0.50 mL.
This test method is under the jurisdiction ofASTM Committee D15 on Engine
Coolants and is the direct responsibility of Subcommittee D15.06 on Glassware
5.6 Volumetric Balance, one-mark, 1000 mL (compliant
Performance Tests.
with Specification E288, Class B requirements).
Current edition approved Nov. 1, 2008. Published December 2008. DOI:
10.1520/D7437-08.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6. Reagents and Materials
contact ASTM Customer Service at [e-mail]. 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: [phone]. Analytical Reagents of the American Chemical Society where
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7437 − 08
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 any precipitate present (in mil-
(CaCl 2H O) in water in a 1000-m
...