2819 - Chromium oxides and hydroxides:

This HTS category, 2819, encompasses chromium oxides and hydroxides. These are inorganic chemical compounds where chromium is bonded to oxygen or hydroxyl groups. This classification is part of Chapter 28, which deals with a wide array of inorganic chemicals.

Within the broader HTS structure, 2819 is distinctly separate from sibling categories such as those for live animals (Chapters 01). Its focus is exclusively on chemical substances. Unlike many other chemical categories that might deal with more complex organic compounds or finished goods, this chapter and specifically this heading are dedicated to basic inorganic chemical elements and compounds.

Category 2819 is further subdivided to provide more specific classifications. The primary distinction is between chromium trioxide (2819.10.00.00), a significant industrial chemical often used as an oxidizing agent and in plating, and all other chromium oxides and hydroxides (2819.90.00.00). This subdivision allows for the accurate classification of various forms and compositions of chromium compounds beyond the most common and industrially prominent trioxide.