2850.00.10.00 - Of tungsten

This HTS classification, 2850.00.10.00, specifically covers hydrides, nitrides, azides, silicides, and borides that are chemically defined and primarily composed of tungsten. This category includes various inorganic tungsten compounds exhibiting these chemical structures, such as tungsten nitride (W₂N, WN), tungsten silicides (e.g., WSi₂), and tungsten borides (e.g., WB, WB₂, WB₅). The classification hinges on the presence of tungsten as the principal element in these specific compound types, distinguishing them from other inorganic compounds of tungsten.

The distinction from sibling categories is crucial for accurate classification. While all fall under the broader heading of hydrides, nitrides, azides, silicides, and borides, this subcategory is exclusively dedicated to those where tungsten is the defining element. For instance, 2850.00.05.00 pertains to compounds of calcium, 2850.00.07.00 to titanium, and 2850.00.20.00 to vanadium, each representing distinct elemental compositions within the same general chemical structure types. Items that do not fit these specific elemental compositions, or are tungsten compounds but not hydrides, nitrides, azides, silicides, or borides, would be classified under the residual "Other" category (2850.00.50.00).

As this is a leaf node within the HTS, there are no further subcategories. Therefore, the classification for goods falling under 2850.00.10.00 is final at this level. Importers and exporters should ensure that the goods precisely match the definition of tungsten-based hydrides, nitrides, azides, silicides, or borides, and are not classified under the "Other" category (2850.00.50.00) which encompasses a broader range of inorganic compounds not specifically enumerated.