ASTM D4660 - 12

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

    Active Standard ASTM D4660 | Developed by Subcommittee: D20.22

    Book of Standards Volume: 08.02


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    ASTM D4660

    Significance and Use

    These test methods can be used for research or for quality control to determine the isomer content of toluene diisocyanates.

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

    1. Scope

    1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene2,4diisocyanate (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 AApplicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer).

    1.1.2 Test Method BApplicable 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 and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D883 Terminology Relating to Plastics

    E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals

    ISO Standard

    ISO15064 PlasticsAromatic Isocyanates for Use in the Production of PolyurethanesDetermination of the Isomer Ratio in Toluenediisocyanate


    ICS Code

    ICS Number Code 83.040.30 (Auxiliary materials and additives for plastics)

    UNSPSC Code

    UNSPSC Code 12352118(Cyanates or isocyanates or thiocyantes or isothiocyanates)


    DOI: 10.1520/D4660-12

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