Propylene Glycol Coolant: A Safer Alternative for Heavy Duty Vehicles

Propylene Glycol (PG) and ethylene glycol (EG) are similar in physical properties and therefore both are good base materials for coolant/antifreeze for heavy duty diesel engines.

Propylene glycol and ethylene glycol are different chemically and have much different toxicological profiles. These differences result in the two products having greatly different safety characteristics which affect product labelling, use, and disposal.

The differences in regulation for these two types of engine coolants as well as the comparisons of performance in heavy duty fleet on-highway service will be addressed. Results of bench-scale and fleet testing will be shown.