2842 - Other salts of inorganic acids or peroxoacids (including aluminosilicates whether or not chemically defined), other than azides:

This HTS category, 2842, encompasses a broad range of inorganic salts derived from acids or peroxoacids, with a specific inclusion of aluminosilicates. It serves as a residual category for inorganic salts not classified elsewhere within Chapter 28. Key to its definition is the exclusion of azides, which are separately classified. This section is vital for identifying a variety of chemical compounds used across numerous industrial applications, from pigments and fillers to catalysts and water treatment agents.

The sibling categories at this level represent distinctly different product groups, primarily live animals. Therefore, the distinction for 2842 is quite clear: it pertains to inorganic chemical compounds rather than biological organisms. Within Section VI and Chapter 28, this category acts as a repository for salts of inorganic acids and peroxoacids that do not fit into more specific headings.

The subcategories within 2842 provide further refinement based on the specific chemical structure of the salts. The primary subdivision, 2842.10.00.00, specifically addresses double or complex silicates, including aluminosilicates. This highlights a significant sub-group of materials with unique properties and applications, such as in ceramics, glass, and detergents. The residual subcategory, 2842.90, captures all other salts of inorganic acids or peroxoacids that do not fall under the double or complex silicate definition, ensuring comprehensive coverage within the broader scope of inorganic salts.