ASTM D1177-16

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Designation: D1177 − 16
Standard Test Method for
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Freezing Point of Aqueous Engine Coolants
This standard is issued under the fixed designation D1177; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 4. Summary of Test Method
1.1 This test method covers the determination of the freez- 4.1 This test method involves the determination of the
ing point of an aqueous engine coolant solution in the time-temperature curve prior to freezing and the determination
laboratory. of the horizontal or flattened portion of the freezing curve.The
freezing point is taken as the intersection of projections of the
NOTE 1—Where solutions of specific concentrations are to be tested,
cooling curve and the freezing curve. If the solution
they shall be prepared from representative samples as directed in Practice
supercools, the freezing point is the maximum temperature
D1176. Secondary phases separating on dilution need not be separated.
NOTE 2—These products may also be marketed in a ready-to-use form
reached after supercooling.
(prediluted).
1.2 The values stated in SI units are to be regarded as the 5. Significance and Use
standard. The values given in parentheses are for information
5.1 The freezing point of an engine coolant indicates the
only.
coolant freeze protection.
1.3 This standard does not purport to address all of the
5.2 The freezing point of an engine coolant may be used to
safety concerns, if any, associated with its use. It is the
determine the approximate glycol content, provided the glycol
responsibility of the user of this standard to establish appro-
type is known.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Apparatus
6.1 Freezing Point Apparatus, shown assembled in Fig. 1,
2. Referenced Documents
consisting of the following:
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2.1 ASTM Standards:
6.1.1 Cooling Bath, in which the refrigerant is contained,
D1176Practice for Sampling and Preparing Aqueous Solu-
consisting of a standard 1.9-L (2-qt) Dewar flask. The flask
tionsofEngineCoolantsorAntirustsforTestingPurposes
may be silvered or unsilvered, and is supported in a close-
E1Specification for ASTM Liquid-in-Glass Thermometers
fitting container.Apad of glass wool is placed in the bottom of
the flask to protect it from damage by tip of freezing tube.
3. Terminology
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6.1.2 Freezing Tube consisting of a 200-mL (6.8-oz.)
3.1 Definitions:
unevacuated, unsilvered Dewar flask. The tube is closed by a
3.1.1 freezing point—the temperature at which crystalliza-
cork having a central hole for the thermocouple or resistance
tion begins in the absence of supercooling, or the maximum
thermometer, a second hole placed to one side for passage of
temperature reached immediately after initial crystal formation
the stirring rod, and a third hole for introducing wire for
in the case of supercooling, or the temperature at which solid
seeding at appropriate time.
crystals,formedoncooling,disappearwhenthetemperatureof
6.1.3 Stirring Mechanism, consisting of a five-coil stirrer
the specimen is allowed to rise. 1
formedofstainlesssteelwire1.6mm( ⁄16in.)indiameter.The
coils are so spaced that, in the extreme upward position during
operation, no coils are exposed above the surface of the
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This test method is under the jurisdiction ofASTM Committee D15 on Engine
sample. The stirrer is agitated by means of an ordinary
Coolants and Related Fluids and is the direct responsibility of Subcommittee
windshield wiper motor or other motor devices, operating
D15.03 on Physical Properties.
Current edition approved April 1, 2016. Published May 2016. Originally through suitable linkages so as to provide linear motion of the
approved in 1951. Last previous edition approved in 2012 as D1177–12. DOI:
10.1520/D1177-16.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM For routine work, a tube with a seeding tip as described in the paper by R. E.
Standards volume information, refer to the standard’s Document Summary page on Mallonee and F. L. Howard, “The Determination of Freezing Point of Engine
the ASTM website. Antifreeze,” in the February 1951 issue of the ASTM Bulletin may be used.
*A Summary of Changes section appears at the end of this standard
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D1177 − 16
FIG. 1 A
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