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ASTM D3644-15

Current Revision

Standard Test Method for Acid Number of Styrene-Maleic Anhydride Resins

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1.1 This test method covers the measurement of the free acidity present in styrene-maleic anhydride resins.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 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.


4.1 This test method is used to determine the property of styrene-maleic anhydride resins functionality. Acid functionality determines the utility of resin as well as being a significant quality control test.

4.2 Because some of the anhydride functionality has been hydrolyzed in the manufacturing process, direct titration with base will produce erroneous data on the total acid content of the fully hydrolyzed resin in use. This test method charges excess alkali to hydrolize the anhydride functionality and neutralize the resulting acid. The remaining unreacted alkali is then back titrated with a standardized acid solution and the acid content is determined by difference.

SDO ASTM: ASTM International
Document Number D3644
Publication Date Oct. 1, 2015
Language en - English
Page Count 2
Revision Level 15
Supercedes
Committee D21.02
Publish Date Document Id Type View
Oct. 1, 2015 D3644-15 Revision
June 1, 2006 D3644-06 Revision
Sept. 10, 1998 D3644-98 Revision
Dec. 1, 2022 D3644-15R22 Reaffirmation
Oct. 1, 2012 D3644-06R12 Reaffirmation
Sept. 1, 2004 D3644-98R04 Reaffirmation