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ASTM D8031-16(2024)

Historical Reaffirmation

Standard Test Method for Acid Number of Terephthalic Acid (TA) by Automatic Potentiometric Titration

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1.1 This test method covers the determination of acid number in terephthalic acid (TA) by automatic potentiometric titration. As the index of TA purity, acid number is usually within 674 mg KOH/g to 676 mg KOH/g.

1.2 In determining the conformance of the test results using this method, results shall be rounded off in accordance with the rounding-off method of Practice E29.

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.


5.1 An estimate of TA purity can be determined by titrating with KOH. As an index of TA purity, the acid number can be used as a guide in the quality control of TA production.

SDO ASTM: ASTM International
Document Number D8031
Publication Date July 1, 2024
Language en - English
Page Count 4
Revision Level 16(2024)
Supercedes
Committee D16.02
Publish Date Document Id Type View
March 1, 2016 D8031-16 Revision
July 1, 2024 D8031-16R24 Reaffirmation