2805.19 - Other:

This HTS category, 2805.19, encompasses alkali metals other than sodium and calcium. Alkali metals are highly reactive metallic elements characterized by their single valence electron, making them soft and yielding. This heading specifically includes elements that fall under the broad classification of alkali metals but are not explicitly listed as separate subheadings, namely sodium (2805.11) and calcium (2805.12).

Therefore, 2805.19 serves as a residual category for alkali metals that do not fit into the more specific classifications of sodium or calcium. Examples of materials that would fall under this heading include lithium, potassium, rubidium, and cesium, when presented in their elemental form. The key distinguishing factor from its sibling categories is the specific elemental identity of the alkali metal.

Within 2805.19, further subdivisions exist to refine the classification of these remaining alkali metals. The subcategories are 2805.19.10.00 for Strontium, 2805.19.20.00 for Barium, and 2805.19.90 for any other alkali metals not specifically listed. These subcategories allow for more precise tracking and tariff application based on the particular element in question, acknowledging the distinct properties and uses of each.