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ASTM D7253-22

Current Revision

Standard Test Method for Polyurethane Raw Materials: Determination of Acidity as Acid Number for Polyether Polyols

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1.1 This test method measures the acidic constituents in polyether polyols and reports the results as acid number. The typical acid number range is 0-0.1 mg KOH/g sample. (See Note 1.)

1.2 The values stated in SI units are to be regarded as 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Note 1: There is no known ISO equivalent to this standard.

1.4 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 This test method is suitable for quality control, as a specification test, and for research. Acid numbers indicate the extent of any neutralization reaction of the polyol with acids. The results of this method measure batch-to-batch uniformity and are used as correction factors in calculating true hydroxyl numbers.

SDO ASTM: ASTM International
Document Number D7253
Publication Date March 15, 2022
Language en - English
Page Count 3
Revision Level 22
Supercedes
Committee D20.22
Publish Date Document Id Type View
March 15, 2022 D7253-22 Revision
Sept. 1, 2016 D7253-16 Revision
April 1, 2006 D7253-06 Revision
Sept. 1, 2011 D7253-06R11E01 Reaffirmation