9902.04.89 - Carbonohydrazide (CAS No. 497-18-7) (provided for in subheading 2928.00.50)

HTS Code 9902.04.89 specifically classifies Carbonohydrazide (CAS No. 497-18-7). This chemical compound, primarily used as a blowing agent in the production of plastics and rubber, falls under Section XXII of the Harmonized Tariff Schedule, which encompasses temporary legislation and special provisions. Its inclusion in Chapter 99 indicates that it is subject to specific, often temporary, import restrictions or modifications proclaimed under trade agreements or agricultural adjustment legislation, rather than being a standard, ongoing tariff classification under the main chapters of the HTS.

This classification is distinct from the general chemical classifications found in Chapters 28 and 29. While Carbonohydrazide is noted as being provided for in subheading 2928.00.50 (which covers organic derivatives of hydrazine), its presence in Chapter 99 signifies a departure from standard tariff treatment due to the specific legislative or trade policy context under which it is imported. Therefore, this category is not for general import of Carbonohydrazide but rather for imports subject to the special rules and provisions outlined in Chapter 99.

As a leaf node, HTS Code 9902.04.89 has no further subcategories. This means that any import of Carbonohydrazide classified under this specific code will be subject to the full set of regulations and duties associated with this particular Chapter 99 provision. Importers must ensure that their shipments fully comply with the requirements of this special classification, which may include specific documentation, quantity limitations, or other conditions dictated by the temporary legislation or trade proclamation.