2825 - Hydrazine and hydroxylamine and their inorganic salts; other inorganic bases; other metal oxides, hydroxides and peroxides:

This HTS category, 2825, encompasses a diverse group of inorganic chemical substances. Primarily, it includes hydrazine and hydroxylamine, along with their inorganic salts, which are often utilized as reducing agents, propellants, or in the synthesis of pharmaceuticals and agricultural chemicals. The scope further extends to various other inorganic bases, as well as a broad range of metal oxides, hydroxides, and peroxides. These substances can be found in various industrial applications, from pigments and catalysts to water treatment and ceramics.

Distinguishing this category from its siblings at Chapter 28, which deals with inorganic chemicals, is crucial. While other Chapter 28 headings might cover specific elements, acids, or salts with distinct properties, heading 2825 focuses on a particular set of nitrogen-based compounds (hydrazine and hydroxylamine) and a broad assortment of metal oxides, hydroxides, and peroxides not specifically classified elsewhere. For instance, while metallic elements and their compounds might be covered in other headings, 2825 specifically addresses their oxide, hydroxide, and peroxide forms where appropriate.

The subcategories within 2825 provide a detailed breakdown of the specific chemical compounds. These subdivisions are based on the chemical composition and often the specific metal involved. For example, distinct lines exist for lithium, vanadium, nickel, copper, germanium, zirconium, molybdenum, and antimony compounds, reflecting their unique properties and common industrial uses. The final "Other" subheading and the mention of "V. SALTS AND PEROXYSALTS, OF INORGANIC ACIDS AND METALS" indicate that this heading also serves as a residual category for inorganic bases and metal compounds of the described types that do not fit into the more specific subheadings.