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Significance and Use
5.1 The presence of acids or glycol esters in the glycol used to produce engine coolant is undesirable. Under conditions in an engine cooling system, the esters can hydrolyze to form glycol and an acid. The acid will react with the corrosion inhibitors, thereby reducing the useful life of the coolant. This method can determine the amount of acid and glycol ester present in the glycol.
1.1 This test method covers the determination of free acids and glycol esters in glycols by titration.
1.2 This test method is typically used on glycols used for the manufacture of engine coolant. It cannot be used on formulated engine coolant. The inhibitors will interfere with the determination.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1176 Practice for Sampling and Preparing Aqueous Solutions of Engine Coolants or Antirusts for Testing Purposes
D1193 Specification for Reagent Water
D4725 Terminology for Engine Coolants and Related Fluids
D7638 Test Method for Determination of Fatty Acids and Esters in Glycerin
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ICS Number Code 71.100.45 (Refrigerants and antifreezes)
UNSPSC Code 25174004(Engine coolant)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D7736-19a, Standard Test Method for Determination of Acids and Glycol Esters in Glycols, ASTM International, West Conshohocken, PA, 2019, www.astm.orgBack to Top