1.1 This test method covers the measurement of the free acidity present in the nonvolatile portion of varnishes, oils, certain resins, and paint vehicles, by the reaction with standard alkali solution.
1.2 If carboxylic anhydrides are present, only one half of the reactive groups will be titrated and indicated by this test method.
1.3 This standard does not purport to address 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.
ASTM D1639-90(1996)e1 Referenced Document
ASTM D1259 Standard Test Methods for Nonvolatile Content of Resin Solutions
ASTM D1644 Standard Test Methods for Nonvolatile Content of Varnishes