2806 - Hydrogen chloride (Hydrochloric acid); chlorosulfuric acid:

Chapter 28 of the Harmonized Tariff Schedule (HTS) encompasses a broad range of inorganic chemicals. Within this chapter, heading 2806 specifically addresses hydrogen chloride, commonly known as hydrochloric acid, and chlorosulfuric acid. These are important industrial chemicals with various applications, primarily as reagents, catalysts, and in processes such as metal pickling and chemical synthesis.

Distinguishing this category from its siblings at the root level of the HTS database, such as live animals (Chapter 01), highlights the fundamental difference in subject matter. While those headings deal with biological organisms, heading 2806 falls under the chemical sector, focusing on manufactured chemical substances rather than living beings. The scope of Chapter 28 is thus entirely distinct from other introductory chapters of the HTS.

Heading 2806 is further subdivided to differentiate between its two primary chemical compounds. The subcategory 2806.10.00.00 covers hydrogen chloride in its various forms, including aqueous solutions (hydrochloric acid). The subcategory 2806.20.00.00 is reserved for chlorosulfuric acid, a distinct chemical compound with its own unique properties and industrial uses. This bifurcation is based on the chemical identity and specific applications of these two substances.