ASTM D5828 Standard Test Method for Compatibility of Supplemental Coolant Additives (SCAs) and Engine Coolant Concentrates
4. Summary of Test Method
4.1 A mixture of engine coolant concentrate and deionized water containing approximately twice the recommended concentration of SCA is heated to 88°C (190°F) for 24 h. The solution is centrifuged after returning to ambient temperature, and the amount of insoluble material is determined volumetrically and compared to the amount of insolubles obtained with a mixture of standard reference SCA and reference engine coolant.
5. Significance and Use
5.1 This test was developed to mimic the formation of insolubles observed in some heavy-duty diesel cooling systems during the mid 1980s. It measures the compatibility of SCA and coolant concentrate solutions according to their tendency to form insolubles in service. Such insoluble materials may accumulate within a cooling system, restrict heat transfer through radiator cores, and contribute to the damage of components such as water pumps.
