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Significance and Use
4.1 This test method is not appropriate for alkali-soluble resins whose acid functionality is due to incorporated anhydrides. Variations in manufacture, storage, and possible contamination of anhydride functional resins may cause partial hydrolysis, or esterification, which will invalidate data from this test method. Anhydride functional resins should be characterized by Test Method .
4.2 This test method is used to measure a property of acid functionalized resins. Acid number determines the utility of resins as well as being a significant quality control measure.
1.1 This test method covers the measurement of the free acidity present in certain alkali-soluble resins.
1.2 This test method is not suitable for styrene-maleic anhydride resins.
1.3 The resin manufacturer should specify whether or not this test method may be used for his product(s).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D362 Specification for Industrial Grade Toluene
D1152 Specification for Methanol (Methyl Alcohol)
D1193 Specification for Reagent Water
ASTM D3643-15, Standard Test Method for Acid Number of Certain Alkali-Soluble Resins, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top