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ASTM D4273-23

Current Revision

Standard Test Method for Polyurethane Raw Materials: Determination of Primary Hydroxyl Content of Polyether Polyols

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1.1 Carbon-13 Nuclear Magnetic Resonance Spectroscopy (13C NMR) measures the primary hydroxyl content of ethylene oxide (EO)-propylene oxide (PO) polyether polyols used in preparing flexible polyurethane foams. This method is best suited for polyether polyols with primary hydroxyl contents of 10 to 90 %.

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 The primary hydroxyl content provides information about the relative reactivities of polyols in the urethane forming reaction with isocyanates.

SDO ASTM: ASTM International
Document Number D4273
Publication Date March 1, 2023
Language en - English
Page Count 7
Revision Level 23
Supercedes
Committee D20.22
Publish Date Document Id Type View
March 1, 2023 D4273-23 Revision
April 1, 2018 D4273-18 Revision
April 1, 2011 D4273-11 Revision
July 1, 2005 D4273-05 Revision
Nov. 10, 1999 D4273-99 Revision