2811.12.00.00 - Hydrogen cyanide (hydrocyanic acid)

This HTS category, 2811.12.00.00, specifically covers hydrogen cyanide, also known as hydrocyanic acid. It is a highly toxic and volatile chemical compound with the formula HCN. This classification is found within Chapter 28, which deals with inorganic chemicals, and more precisely under the heading for "Other inorganic acids and other inorganic oxygen compounds of nonmetals."

Within the broader grouping of "Other inorganic acids," this specific code distinguishes itself from its sibling category, 2811.11.00.00, which is designated for hydrogen fluoride (hydrofluoric acid). While both are strong inorganic acids, hydrogen cyanide is characterized by its gaseous state at room temperature and its distinct chemical properties and applications. The sibling category 2811.19, "Other," serves as a catch-all for inorganic acids not otherwise specified.

As a leaf node, 2811.12.00.00 has no further subcategories. Therefore, its classification is specific to pure hydrogen cyanide, whether in its anhydrous liquid form or as an aqueous solution. This classification would apply to the pure chemical substance itself, and not to products where hydrogen cyanide is a minor component or used in a process without being the primary article of import or export. Its highly hazardous nature often necessitates strict import and export controls.