ASTM D6660-01(2023)
(Test Method)Standard Test Method for Freezing Point of Aqueous Ethylene Glycol Base Engine Coolants by Automatic Phase Transition Method
Standard Test Method for Freezing Point of Aqueous Ethylene Glycol Base Engine Coolants by Automatic Phase Transition Method
SIGNIFICANCE AND USE
5.1 The freezing point of an engine coolant indicates the coolant freeze protection.
5.2 The freezing point of an engine coolant may be used to determine the approximate glycol content, provided the glycol type is known.
5.3 Freezing point as measured by Test Method D1177 or approved alternative method is a requirement in Specifications D3306 and D6210.
5.4 This test method provides results that are equivalent to Test Method D1177 and expresses results to the nearest 0.1 °C with improved reproducibility over Test Method D1177.
5.5 This test method determines the freezing point in a shorter period of time than Test Method D1177.
5.6 This test method removes most of the operator time and judgement required by Test Method D1177.
SCOPE
1.1 This test method covers the determination of the freezing point of an aqueous engine coolant solution.
1.2 This test method is designed to cover ethylene glycol base coolants up to a maximum concentration of 60 % (v/v) in water; however, the ASTM interlaboratory study mentioned in 12.2 has only demonstrated the test method with samples having a concentration range of 40 % to 60 % (v/v) water.
Note 1: Where solutions of specific concentrations are to be tested, they shall be prepared from representative samples as directed in Practice D1176. Secondary phases separating on dilution need not be separated.
Note 2: The products may also be marketed in a ready-to-use form (prediluted).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Some specific hazards statements are given in 7.3.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6660 − 01 (Reapproved 2023)
Standard Test Method for
Freezing Point of Aqueous Ethylene Glycol Base Engine
1
Coolants by Automatic Phase Transition Method
This standard is issued under the fixed designation D6660; 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 tions of Engine Coolants or Antirusts for Testing Purposes
D1177 Test Method for Freezing Point of Aqueous Engine
1.1 This test method covers the determination of the freez-
Coolants
ing point of an aqueous engine coolant solution.
D3306 Specification for Glycol Base Engine Coolant for
1.2 This test method is designed to cover ethylene glycol
Automobile and Light-Duty Service
base coolants up to a maximum concentration of 60 % (v ⁄v) in
D6210 Specification for Fully-Formulated Glycol Base En-
water; however, the ASTM interlaboratory study mentioned in
gine Coolant for Heavy-Duty Engines
12.2 has only demonstrated the test method with samples
having a concentration range of 40 % to 60 % (v ⁄v) water.
3. Terminology
NOTE 1—Where solutions of specific concentrations are to be tested, 3.1 Definitions of Terms Specific to This Standard:
they shall be prepared from representative samples as directed in Practice
3.1.1 automatic phase transition method, n—in this
D1176. Secondary phases separating on dilution need not be separated.
standard, the procedures of automatically cooling an engine
NOTE 2—The products may also be marketed in a ready-to-use form
coolant sample until solid crystals appear, followed by con-
(prediluted).
trolled warming and recording the temperature at which the
1.3 The values stated in SI units are to be regarded as
crystals redissolve into the liquid phase.
standard. No other units of measurement are included in this
3.1.2 freezing point, n—the temperature at which crystalli-
standard.
zation begins in the absence of supercooling, or the maximum
1.4 This standard does not purport to address all of the
temperature reached immediately after initial crystal formation
safety concerns, if any, associated with its use. It is the
in the case of supercooling, or the temperature at which solid
responsibility of the user of this standard to establish appro-
crystals, formed on cooling, disappear when the temperature of
priate safety, health, and environmental practices and deter-
the specimen is allowed to rise.
mine the applicability of regulatory limitations prior to use.
3.1.3 peltier device, n—a solid state thermoelectric device
Some specific hazards statements are given in 7.3.
constructed with dissimilar semiconductor materials, config-
1.5 This international standard was developed in accor-
ured in such a way that it will transfer heat to and away from
dance with internationally recognized principles on standard-
a test specimen dependent on the direction of electric current
ization established in the Decision on Principles for the
applied to the device.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Summary of Test Method
Barriers to Trade (TBT) Committee.
4.1 A specimen is cooled by a Peltier device while continu-
2. Referenced Documents ously being illuminated by a light source. The specimen is
2 continuously monitored by an array of optical detectors for the
2.1 ASTM Standards:
first formation of crystals. Once the crystals are formed, the
D1176 Practice for Sampling and Preparing Aqueous Solu-
specimen is then warmed at controlled rates until all the
crystals return to the liquid phase. The detectors are sufficient
1
in number to ensure that any crystals are detected. The
This test method is under the jurisdiction of ASTM Committee D15 on Engine
Coolants and Related Fluids and is the direct responsibility of Subcommittee
specimen temperature at which the crystals return to the liquid
D15.03 on Physical Properties.
phase is recorded by the temperature sensor as the freezing
Current edition approved Sept. 1, 2023. Published September 2023. Originally
point.
approved in 2001. Last previous edition approved in 2019 as D6660 – 01 (2019).
DOI: 10.1520/D6660-01R23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Significance and Use
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 The freezing point of an engine coolant indicates the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. co
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