A New Test Method for Compatibility of Supplemental Coolant Additives (SCA) and Engine Coolant Concentrates

Compatibility of coolant concentrate and SCA/water mixtures can be measured by their tendency to form insolubles during short term exposure to simulated operating conditions. A relatively simple, basic compatibility method was chosen to study the amount of silicate gel formed by coolant concentrate/SCA/water mixtures.. The method was modified to improve precision by first studying, then controlling key experimental factors. Further refinements were made to the method and a precision round robin was performed as part of the activity of the ASTM Committee D.15 on Engine Coolants.