【国外标准】 Standard Test Method for Relative Density of Engine Coolant Concentrates and Engine Coolants By The Hydrometer

4.1 The relative density of an engine coolant may be used to determine the approximate percent glycol, freezing point, and boiling point, provided the glycol type is known.4.2 The relative density of an engine coolant concentrate can be used as a production control test.4.3 ASTM specifications normally state the temperatures for relative density of fluids; 25 °C, 20 °C, and 15.6 °C are commonly used temperatures.1.1 This test method covers the determination of the relative density of glycols, glycerin, heat transfer fluids, engine coolant concentrates, and aqueous engine coolants.1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 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.