2846.90.80.90 - Other

This HTS category, 2846.90.80.90, encompasses "Other" inorganic or organic compounds of rare-earth metals, yttrium, or scandium, that are not specifically classified under other subheadings within 2846.90. This includes a broad range of chemical substances where these specific metals are present, either as the primary component or as a significant alloying or constituent element, and do not fall into more precisely defined categories. The key criterion for inclusion here is the presence of rare-earth metals (such as lanthanum, cerium, neodymium, etc.), yttrium, or scandium in a chemical compound form.

This subheading is distinct from its sibling category, "Mixtures of rare-earth carbonates other than of cerium carbonate." While both fall under the broader classification of rare-earth compounds, this category 2846.90.80.90 is for compounds *other than* simple carbonate mixtures of specific rare-earth metals. It would cover a wider array of chemical forms, such as oxides, halides, sulfates, or organometallic compounds of these metals, provided they are not further specified elsewhere. The scope is intentionally broad to capture all remaining relevant compounds.

As this is a leaf node within the HTS, there are no further subcategories. Therefore, classification into 2846.90.80.90 relies on the meticulous examination of the chemical composition and the absence of a more specific tariff provision at a higher or equal level of detail. Importers and exporters should consult product specifications, chemical analyses, and relevant trade regulations to ensure accurate classification for these miscellaneous rare-earth, yttrium, or scandium compounds.