Plastics. Aromatic isocyanates for use in the production of polyurethanes. Determination of the isomer ratio in toluenediisocyanate
This document specifies methods for the measurement of toluene-2,6-diisocyanate in mixtures of the 2,4- and 2,6-isomers. Two methods based on infrared spectroscopy are used to give accurate results over a broad range of isomer concentrations. MethodĀ A is applicable to toluenediisocyanate (TDI) samples containing between 5Ā % and 95Ā % of the 2,6-isomer. MethodĀ B is applicable to TDI samples containing 0Ā % to 5Ā % of the 2,6-isomer. Both methods are based on the quantitative measurement of absorption bands arising from out-of-plane CāH deformation vibrations of the aromatic ring at 810Ā cmā1 and 782Ā cmā1 (12,3 μm and 13,8 μm).
| SDO | BSI: British Standards Institution |
| Document Number | ISO 15064 |
| Publication Date | July 28, 2017 |
| Language | en - English |
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| Supercedes | |
| Committee | PRI/42 |
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