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This heading includes :
(1) Isocyanates
This group of chemicals includes mono- and polyfunctional isocyanates. Isocyanates with di- or higher functionality, such as methylene diphenyl isocyanate (MDI), hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI) and toluene diisocyanate dimer, are used extensively in the manufacture of polyurethanes.
This heading excludes poly(methylene phenyl isocyanate) (crude MDI or polymeric MDI) (heading 39.09). (2) Isocyanides (carbylamines). (3) Azides of carboxylic acids. (4) Organic-substituted amide derivatives of inorganic acids (other than carbonic acid) and organic-substituted imide derivatives of inorganic acids. (5) Calcium cyclamate (calcium cyclohexylsulphamate). (6) Octamethylpyrophosphoramide (OMPA). (7) Dimethylnitrosamine. (8) Methyltrinitrophenylnitramine (tetryl), etc. Used as an explosive. (9) Nitroguanidine. Explosive.
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