2825.90 - Other:

This HTS category, 2825.90, encompasses a diverse range of inorganic bases, metal oxides, hydroxides, and peroxides that are not specifically enumerated under preceding subheadings within Chapter 2825. It serves as a residual category for these inorganic compounds when they do not fall into the more specific classifications for hydrazine and hydroxylamine salts, lithium, vanadium, nickel, or copper oxides and hydroxides. The key characteristic for inclusion here is that the substance is an inorganic base, metal oxide, hydroxide, or peroxide, and its specific chemical composition or primary metal does not warrant classification in a more granular subheading.

Distinguishing 2825.90 from its sibling categories is crucial for accurate classification. For instance, while 2825.10.00.00 precisely defines hydrazine and hydroxylamine and their inorganic salts, and subheadings like 2825.20.00.00 through 2825.50 clearly delineate specific metal oxides and hydroxides (lithium, vanadium, nickel, and copper), this subheading captures all other such inorganic compounds. Therefore, any metal oxide, hydroxide, or inorganic base not otherwise specified is likely to be found within the scope of 2825.90.

The subcategories under 2825.90 further refine the classification of these "other" inorganic compounds. For example, 2825.90.10.00 specifically addresses beryllium oxide and hydroxide, while 2825.90.20.00 and 2825.90.30.00 provide distinct classifications for tin and tungsten oxides, respectively. This detailed breakdown allows for more precise identification based on the specific metal or compound involved, ensuring that widely traded or distinct chemical entities are appropriately categorized rather than being grouped under the general "Other" subheading (2825.90.90.00). The latter is reserved for those inorganic bases, metal oxides, hydroxides, and peroxides not otherwise enumerated in any part of heading 2825.