ASTM D8116-18

1.1 A non-aqueous engine coolant is a glycol, diol, triol, or mixtures thereof, based heat transfer fluid containing less than 1.0 % water when formulated and intended for final use without dilution with water. (Definition from Terminology D4725.)

1.2 This specification covers the requirements for fully formulated non-aqueous glycol base coolants for cooling systems of heavy-duty engines. These coolants will function effectively during both winter and summer to provide protection against corrosion, cavitation, freezing, boiling, and excessive viscosity.

1.3 This specification is intended to cover the requirements for non-aqueous engine coolants prepared from virgin glycols, diols, or triols, or mixtures thereof.

1.4 Coolants meeting this specification exhibit very low vapor pressures under all operating conditions, thereby avoiding the creation and collapse of coolant vapor, the primary cause of pump and cylinder liner cavitation erosion. They may additionally contain additives that provide traditional anti-cavitation erosion coatings but there is no requirement that they must. Non-aqueous engine coolants usually contain one or more carboxylates and do not normally contain nitrites. It is suggested that coolant testing be undertaken at normal manufacturer’s recommended intervals to monitor degradation products. The low vapor pressures inherent in coolants that meet this specification also provide protection from hot surface scaling, as liquid coolant is in contact with all hot metal surfaces of the engine cooling system at all times.

1.5 Water is a contaminant to non-aqueous engine coolants and it is suggested that water content be tested periodically with test strips to ideally keep water content of the coolant at 3 % or less. Increases in water cause an undesirable drop in the boiling point. It is instructive that the glassware corrosion testing per this specification is conducted at 6 % corrosive water.

1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.