ASTM D1122
ASTM D1122 – Standard Test Method for Relative Density of Engine Coolant Concentrates and Engine Coolants By The Hydrometer Description: Significance and Use 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 …