ASTM D1177 - 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 content, provided the glycol type is known.
1.1 This test method covers the determination of the freez-ing 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 the standard. The values given in parentheses are for information only.
Extracted, with permission, from ASTM D1177-17 - Freezing Point of Aqueous Engine Coolants, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the complete standard may be purchased from ASTM International, astm.org