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ASTM D7518-10(2015)e1

ASTM D7518-10(2015)e1

Standard Specification for 1,3 Propanediol (PDO) Base Engine Coolant for Automobile and Light-Duty Service

2020-04-15 /Historical
Superseeded by:

This specification covers the requirements for propanediol base engine coolant used in automobiles or other light-duty service cooling systems. Engine coolant concentrates or prediluted propanediol base engine coolant shall be formulated with propanediol, water, suitable corrosion inhibitors, dye, and a foam suppressor. The coolants shall conform to the general requirements for color and effect on nonmetals. Coolants shall be formulated using water that meets the requirements for the following properties: chlorides, sulfate, hardness, ph, and iron. Glycol-base coolant concentrates and prediluted coolants shall conform to the following physical and chemical requirements for each coolant type: relative density, freezing point, boiling point, ash content, pH, chloride, water mass, reserve alkalinity, and effects on automobile finish. All coolant concentrates and prediluted coolants shall conform to the performance requirements such as corrrosion in glassware, simulated service test, corrosion of cast aluminum alloys at heat-rejecting surfaces, foaming, and cavitation-erosion.


1.1 This specification covers the requirements for 1,3 propanediol base engine coolants used in automobiles or other light-duty service cooling systems. When concentrates are used at 40 to 70 % concentration by volume in water, or when prediluted glycol base engine coolants (50 volume % minimum) are used without further dilution, they will function effectively to provide protection against freezing, boiling, and corrosion.

1.2 The coolants governed by this specification are categorized as follows:

Coolant Type





1,3 Propanediol base concentrate


1,3 Propanediol predilute (50 vol %)

Note 1: This specification is based on the knowledge of the performance of engine coolants prepared from new or virgin ingredients.

Note 2: This specification applies to automobiles and light-duty service. A specification for heavy-duty engine service is under development.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

1,3-propanediol; engine coolant; engine coolant concentrate; light-duty engine coolant; PDO; prediluted engine coolant;
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