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ASTM D4660-23

Current Revision

Standard Test Methods for Polyurethane Raw Materials: Determination of the Isomer Content of Toluenediisocyanate

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1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate (2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided to give accurate results over the broad range of isomer concentrations possible.

1.1.1 Test Method A—Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).

1.1.2 Test Method B—Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer).

Note 1: These test methods are equivalent to ISO 15064.

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.

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 These test methods are suitable for research or for quality control to determine the isomer content of toluene diisocyanates.

5.2 The isomer content of a toluene diisocyanate relates to its reactivity.

SDO ASTM: ASTM International
Document Number D4660
Publication Date March 15, 2023
Language en - English
Page Count 6
Revision Level 23
Supercedes
Committee D20.22
Publish Date Document Id Type View
March 15, 2023 D4660-23 Revision
April 1, 2018 D4660-18 Revision
May 1, 2012 D4660-12 Revision
Sept. 1, 2006 D4660-06 Revision
Nov. 10, 2000 D4660-00 Revision
March 15, 2006 D4660-00R06E01 Reaffirmation