ASTM D6660 for Freezing Point of Aqueous Ethylene Glycol Base Engine Coolants
ASTM D6660 Standard Test Method for Freezing Point of Aqueous Ethylene Glycol Base Engine Coolants by Automatic Phase Transition Method
1. 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 Test Method 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 the standard. The values given in parenthesis are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
D1177 Test Method for Freezing Point of Aqueous Engine Coolants
D3306 Specification for Glycol Base Engine Coolant for Automobile and Light-Duty Service
D6210 Specification for Fully-Formulated Glycol Base Engine Coolant for Heavy-Duty Engines
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 automatic phase transition method, n - in this standard, the procedures of automatically cooling an engine coolant sample until solid crystals appear, followed by controlled warming and recording the temperature at which the crystals redissolve into the liquid phase.
3.1.2 freezing point, n - the temperature at which crystallization begins in the absence of supercooling, or the maximum temperature reached immediately after initial crystal formation in the case of supercooling, or the temperature at which solid crystals, formed on cooling, disappear when the temperature of the specimen is allowed to rise.
3.1.3 peltier device, n - a solid state thermoelectric device constructed with dissimilar semiconductor materials, configured in such a way that it will transfer heat to and away from a test specimen dependent on the direction of electric current applied to the device.
