2852.90 - Other:

This HTS category, 2852.90, encompasses inorganic or organic compounds of mercury that are not chemically defined or are not specifically enumerated under other headings within this chapter. It serves as a residual category for mercury compounds that do not fit into the more specific "chemically defined" classification. The distinction from its sibling, 2852.10, lies in the absence of a precise chemical definition or a lack of specific molecular structure being established for the mercury compound in question.

Within this broad residual category, further subdivisions exist to provide more granular classification. The subcategory 2852.90.05.00 specifically addresses albuminates, tannates, and phosphides of mercury. These are mercury compounds formed with albumin, tannic acid, or phosphorus, respectively, and their inclusion here allows for their separate identification from other, less defined mercury compounds.

The remaining subcategory, 2852.90.90.00, acts as a further residual for all other mercury compounds not covered by the "chemically defined" heading or the specific albuminates, tannates, and phosphides. This ensures that all mercury compounds, regardless of their formulation or chemical definition, are accounted for within the HTS.