【国外标准】 Standard Test Method for Density and Relative Density of Engine Coolant Concentrates and Aqueous Engine Coolants by Digital Density Meter

5.1 Density is a fundamental physical property that can be used in conjunction with other properties to characterize engine coolant concentrates and aqueous engine coolants.5.2 Determination of the density or relative density of these products is necessary for the conversion of measured volumes to volumes at the standard temperature of choice. ASTM specifications normally state the temperatures for density and 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 density or relative density of glycols, glycerin, heat transfer fluids, engine coolant concentrates, and aqueous engine coolants.1.2 This test method should not be applied to samples so dark in color that the absence of air bubbles in the sample cell cannot be established with certainty.1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3.1 The accepted units of measure for density are grams per milliliter or kilograms per cubic meter.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. For specific hazard statements, see 7.4.1.5 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.