This paper will discuss the views and studies that are currently being conducted by the ASTM (American Society for Testing and Materials), D15 Engine Coolants Committee members regarding coolant and cooling system degradation products and their effects. It will include what has been involved in the process of establishing coolant recycling guidelines and several recycling views by heavy-duty manufacturers.
This paper will also overview the process of recycling used coolant by a dual-resin, ion-exchange process and indicate how proper maintenance of cooling systems will lower operation costs and eliminate unscheduled downtime. Purification and performance test data will be shown in regards to TDS (Total Dissolved Solids) removal and reinhibition with proper additive levels not requiring the initial SCA (Supplemental Coolant Additive) addition.
