2826.19.10.00 - Of ammonium

This HTS category, 2826.19.10.00, specifically classifies fluorides that are derived from ammonium. These compounds are inorganic salts containing the fluoride anion, where ammonium (NH₄⁺) is the cation. Examples include ammonium fluoride (NH₄F) and various complex ammonium fluorides. The primary criterion for inclusion here is the presence of ammonium as the constituent cation in the fluoride salt.

This classification is distinguished from its sibling categories by the specific cation. While 2826.19.20.00 covers fluorides where sodium is the cation, and 2826.19.90.00 encompasses all other complex fluoride salts not specifically listed, this category is exclusively for those containing ammonium. The fundamental difference lies in the elemental composition of the cation bonded to the fluoride.

As a leaf node, this category does not have further subdivisions. Therefore, its practical application hinges on accurately identifying whether a fluoride compound contains ammonium as its cation. If a compound is identified as a fluoride but contains a different cation (like sodium) or a more complex structure not falling under the "of ammonium" designation, it would be classified under a different sibling HTS code. This ensures precise customs declarations based on the chemical identity of the imported or exported goods.