Active Standard ASTM D4660 | Developed by Subcommittee: D20.22
Book of Standards Volume: 08.02
Historical (view previous versions of standard)
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.
1.1 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 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.
D883 Terminology Relating to Plastics
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
ISO StandardISO15064 PlasticsAromatic Isocyanates for Use in the Production of PolyurethanesDetermination of the Isomer Ratio in Toluenediisocyanate
ICS Number Code 83.040.30 (Auxiliary materials and additives for plastics)