ASTM D1177 – Standard Test Method for Freezing Point of Aqueous Engine Coolants
Significance and Use
5.1 The freezing point of an engine coolant indicates the coolant freeze protection.
5.2 The freezing point of an engine coolant may be used to determine the approximate glycol or glycerin content, provided the glycol type is known.
1.1 This test method covers the determination of the freezing point of an aqueous engine coolant solution in the laboratory.
NOTE 1: Where solutions of specific concentrations are to be tested, they shall be prepared from representative samples as directed in Practice D1176. Secondary phases separating on dilution need not be separated.
NOTE 2: These products may also be marketed in a ready-to-use form (prediluted).
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.