1.1This 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.

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

Coolant Type	Description

I	1,3 Propanediol base concentrate
II	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.

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

1.4This 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.