Ethylene Glycol type Heavy Duty Engine Coolant provides maximum protection to the six basic metal alloys found in most heat transfer systems. The Coolant is a single phase and ethylene glycol type in nature. The Coolant contains no phosphate or silicates and is able to reduce hard water deposits in the cooling system. Ethylene Glycol type Heavy Duty Engine Coolant is made of ethylene glycol and a highly effective corrosion inhibitor package.